Here are some valuable services that might be of aid in most any business (and do your clients need to know about any of these?):

    
["*" denotes tips for utilizing these in joint venturing]

Business effectiveness tools:  

Email Traffic Tactics - Super-effective strategies for building opt-in email marketing lists, and utilizing them to their fullest capacity - while making the recipients of your messages happy.  (By super-effective email marketer Jimmy D. Brown.)

Franklin Planner Products - The best day planner, period - by FranklinCovey, formerly Franklin/Quest.  (I’ve used it for a few years after failing with others.)  Very popular with busy people in all types of professions.  Paper and digital versions.  *Keep your potential and active joint ventures straight! - as well as planning ahead (and looking behind).

GetResponse.com - A very professional and easy to use unlimited autoresponder service with 2 options, free (one ad at the top - maximum of 5 followups) or with a reasonable monthly charge (no ads, unlimited number of followup messages) - and everything is automated from their servers.  (Autoresponders aren't only useful in selling...  Load articles you've written, *information to share with your joint venture partners, etc.)

InnerTalk.com - the most effective (clinically researched) subliminal tape technology - and a large catalog of economical tapes to choose from, including many that are specifically business- and success-related; highly recommended - this catalog could change your life!

Internet Success Spider - Unlimited-use online software that quickly finds for you all the sites linked to one of your choosing (your competition's, or yours?) and ranks them.  *A great way to find "super affiliates"... or likely joint venture candidates!

Postmaster Express - Automated follow-up e-mail software and more, to make life online so much easier...  Unlimited autoresponders with sophisticated mail merge capabilities.  (Comparison to GetResponse:  You pay once for the software, no monthly fees - and it's useful in a number of other ways in aid of your business.)  Using your own software is far more flexible, but your computer must be on 24/7 to respond immediately to requests for information.)  Bulk e-mailing feature, filtering of incoming messages, contact database management.  (Similar to Mailloop, but more powerful, easier to learn, guaranteed, supported, and about $100 cheaper.)
      

Business support services:

Escrow.com - *For transferring money safely from payer to payee, when each will benefit from the reassurance that the other will be held to his or her part of the bargain.  (One or both parties pay an escrow fee, as in a real estate property transaction.) ...After establishing trust via this method, perhaps the formality won't be needed later on.

PayPal.com  - The most popular means of *making electronic payments between businesses and/or individuals (esp. effective for handling small payments in lieu of the expense of cutting checks), free to both parties.  Auction payments feature.  Mass Payments option (perfect for affiliate commission payments or rebates; downloadable transaction history) for a very small fee.  International payments.  Web Accept feature - accept credit card payments on your site for 2% (compare with any ecommerce provider!).  They even offer mobile phone access to your account!  Money Market yield on funds they hold for you (all accounts insured).

Total Merchant Services - This is the credit card merchant service that's recommended most highly by so many businesses and webmarketing gurus - a very sound company.
    

Selling/promotion-related:    

The Affiliate Marketing Primer - Everything you need to know to get off on the right foot with affiliate marketing, whether as an affiliate or in setting up your own program.  All for free.  (By Sherry Gordon.)

Autopilot Income Streams - Easily learn how to design and write autoresponder e-courses and use them to generate profits online.  *And why not write them for a joint venture partner or client, or for use in the partnership itself?  (By Jimmy D. Brown.)

ClickBank - Perhaps the most popular facility for selling e-books (and other intangible products) online, since it offers merchants an automatic (and free!) single-tier affiliate program.  A one-time set-up fee of $50 allows you to sell up to 50 products under one account.

Free Advertising System - An excellent (e-book) explanation of how and why to set up an affiliate program (particularly for digital infoproducts) and how to promote it... especially via the ClickBank service.  (By Jimmy D. Brown.)

Instant Sales Letters - A database of 33 templates for sales letters of all types, this can be a huge help for any kind of business...  Fill-in-the-blanks, or tailor them to your needs.  (By marketer and ad copywriter Yanik Silver.)

Make Your Price Sell! - An innovative - revolutionary, actually - means of establishing the right price for anything you have to sell, whether product or service, without trial and error (and atttendant expense and income loss).  *Also excellent for feasibility studies, for when you consider a major endeavor.
  

Website optimization-related:

Eye-Popping Popups - First, let me point out that this is about unobjectionable pop-unders too... and a highly effective marketing technique they are - when used judiciously, of course.  A whole slew of ready-to-go, editable templates, plus full instruction on how (and how best) to use them.   (By experienced and successful popup user Jimmy D. Brown.)

Make Your Links Work! (and "Value Exchange" service) - The ebook is free, the service is free (no strings attached), and both are dedicated to helping webmasters develop high-value link strategies (as opposed to wasting time and "weakening your case" with the search engines by exchanging links with any old site); I highly recommend reading this book! - the service itself is a useful shortcut, too, if you wish to go that route.  (By Ken Evoy)

Make Your Site Sell! - This cluster of information-packed e-books is really for anyone interested in marketing, on the web or not...  It's an incredible deal for a small price:  all you need to know to create, or rework, a website to be a success - with many tips for offline marketing as well.  (By webmarketer and affiliate marketer Ken Evoy.)

Make Your Words Sell! - Wonderful, in-depth instruction on how to write great copy, specifically for the internet (websites, email, ezines).  (By two experts, long-time copywriter Joe Robson and webmarketer Ken Evoy.)

Site Build It! - Decently inexpensive web hosting… but with all the expensive trimmings! - which includes automatic major search engine submission, by-the-hand set-up of pages (or use HTML, as preferred) for optimal SE ranking, free domain registration, invaluable help with pay-per-click SEs, easy-to-track statistics and statistics especially for affiliates, and much more…  All of which would cost over $1000/year separately - but of course doesn't (not hardly!).  And check out the monthly free-SBI!-site free sweepstakes.  (Tip:  This is an excellent way to start with a website, or boost a languishing one, and build a traffic base - even if you later take it to other, no-frills hosting.)

WebsiteWizard - Also inexpensive, lead-you-through-it web hosting - a choice of 3 packages (and the low-cost version - under $10 a month, for up to 15 pages - has good features like form-, survey-, popup-, and logo-creators, site templates, 100s of stock photos to choose from, a discussion forum option, even a built-in PayPal shopping cart; #3 allows you to offer your own 2-tier affiliate program); you can pay by the month, or pay yearly for big savings.  (Tip:  This is also a good place to begin, especially if you aren't sure webmarketing is for you and want to try it out on a pay-as-you-go basis - there are lots of possibilities to play around with!)
  

Writing-related - books/ebooks:  

Activ EBook Compiler Create your own E-Books - try it free! - The free version of this sterling, easy-to-master product works very well and is a great place to get acquainted with e-book compiling...  But the (inexpensive) for-pay version allows one to create much larger e-books (without the AEC-advertising on the cover page) and offers an easy way to link password-protected pages to a sales mechanism.  It works for Windows users with Internet Explorer (the vast majority; no need for the reader to use IE exclusively, only have it loaded onto his computer).  The products look professional, HTML links can be added, multimedia is supported, the software provides good e-book security measures, and you can allow your downloaders to customize portions of the book with their own information.  (By webmarketer/programmer Sunil Tanna.)

DynamiteCovers - If you don't want to make your own covers, this is by far the best place to go for cover graphics customized for your own purposes - very professional, and from a very reputable company (others have come and gone over the years - very frustrating); you can purchase one cover, or 2 or 3 at a time for big savings (in any case, you get 2 sizes of each cover made for you); you have a choice of several versions:  ebook, ezine, report, CD, box, wide box, even a membership card (they thought of everything!) - all very handsome looking.

77 Writing Tips for eBook Authors - If you are looking for a quick course on how to choose good topics, collect and organize material for them, and keep motivated (or overcome writer's block), this is the book for you.   I don't know of anyone who better says just what's needed so succinctly and yet thoroughly - and in such a nice-guy way.  (By prolific e-writer Jimmy D. Brown.)

3dCovers.com E-book Cover Templates - By far the best collection of e-book cover templates I've found... and it's huge!  If you're going to do your own covers (you do know that they can boost e-book sales 300%, right?), this is an excellent way to save time and get creative.  Free e-book cover tutorial included in lifetime membership to the site (and the owner is a very helpful guy).  *Many an e-book has been generated (or repackaged) by joint venture partners, and every one needs a cover... why pay someone else to produce them every time (and why use software that produces covers that look like everybody else's)?

The Ultimate Information Entrepreneur's Success Package - A great resource for those who want to produce an ebook but aren't sure what to write about (or put together, or cause to be written by someone else).  The author studied the market and the techniques of many successful ebook promoters (many of whom he interviewed) to make it easy to come up with profitable, business-promoting ebook topics.  (By Jeff Smith.)

ViralPDF - If you use Adobe Acrobat to create popular .pdf ebooks, this software allows you to "rebrand" them (make it possible for others customize them - e.g., with their own affiliate links) - at last!  (By software developer Michael Wagner.)

WriteABookNow - A complete "kit" (course, really) on producing your own fiction or non-fiction book in 14 days - guaranteed!  For the absolute beginner (the course format keeps you motivated through the process - as does the teacher himself), but used by many published authors to dramatically improve their output.  Includes "blueprinting" an entire book in 2 hours, getting an agent, creating demand for the book, and free editing.  (By successful author and teacher of writing Steve Manning.)
  

Writing-related - newsletters:

EzineAnnouncer - Revolutionary software that allows you to announce the existence of your e-zine (and articles - *for instance, those that highlight a joint-ventured offering) to a vast array of directories, lists, and free ad sources... and select individual listings to track results.  Submissions are fully automated where possible, but it sets aside those sources requiring email submissions (and mail-merges them).  What a time saver!

E-zine Launch - An excellent step-by-step e-book on how to set up one's own e-zine (critical in attracting people, and keeping people coming back, to one's website, consulting business, etc.).  (By e-zine pundit Dr. Mani Sivasubramanian.)

Ezine Profit Producer - Learn about how to profit from writing articles and submitting them (via several means) to others' ezines.  Includes excellent advice on what and how to write.   (By Jimmy D. Brown.)

LeadFactory - (Formerly called Opt-In List Builder...)  A powerful, targeted way to build an e-zine or autoresponder subscriber base for very little expense per new opt-in subscriber.  (One webmarketer I'm acquainted with quickly built his e-zine, when new, to over 50,000 subscribers largely with this method.)

    
*Entirely JV-related: