A1Books
Capsule Review: Referral program that enables people to make referrals even without being on the Web.
Payout: Two options available. 10% commission (rising to 12% after $25,000 a year in sales) for websites. Special program for "real life" i.e. for people without websites: 10% of books bought with specified A1 Discount Code, for sales up to $25,000 per year. Beyond that figure, the commission rises to 12%. All you do is tell people your discount code and ask them to use it when they purchase online. Since visitors need to enter your discount code in order for you to get paid, you will probably need to assign a percentage of your take to that discount code. For instance, you can set your discount code to 4% meaning that people will get 4% off their order if they enter your code. You would then get 6% (10% minus the 4% for your discount code) commission on that sale.
Help: Unknown
Rating:
Return: (on web), (off web)
More Information: Here

Alt.Bookstore
Capsule Review: Interesting program that rewards the first site to send a particular customer to the site; tracks the customer so that all subsequent purchases are paid too.
Payout: 10% of all books purchased
Help: Graphics and search form
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More Information: Here

Amazon.com
Capsule Review: Referral program from "Earth's Largest Bookstore"; in use by many major sites. Relatively low commission rate, but helped by huge name recognition. Also offers an affiliate program for CDs and videos.
Payout: 5% of all books bought by visitor coming through general link to Amazon.com; 15% of value of books that are specifically linked to.
Help: Lots of help offered in setting up a bookstore. Examples, clipart and graphics, plus up to 20 scanned book covers can be taken from Amazon.com. Also a search engine form and more stuff.
Rating:
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More Information: Here

BarnesandNoble.com
Capsule Review: Huge online competitor to Amazon.com.
Payout: 5% of all books purchased, 6% for sales over $20,000/year, incredibly optimistic 7% for sales over $1 million per year!
Help: Unknown
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More Information: Here

Book Express
Capsule Review: Specializes in selling books at hefty discounts between 30% and 90% off the cover price. Can be combined with any other affiliate program.
Payout: 10% on all purchases a customer makes, forever (or at least for the lifetime of the relevant cookie). Therefore only pays for new customers.
Help: Unknown
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More Information: Here

Bookpages
Capsule Review: A large online bookstore in the UK. Offers limited CO-branding possibilities as you can ask to add a graphic logo and link back to your site from the results page your visitors will see when they click through to Bookpages.
Payout: 8% cash on first order after visitor clicks through link; 10% if you choose to take the commission in books from the site. Paid in UK pounds.
Help: Search forms, graphics
Rating:
Return: (cash), (books)
More Information: Here

Books.com
Capsule Review: The original online bookstore, Bookstacks, now under a new domain name.
Payout: 12% of all books ordered
Help: Graphics, order buttons, search engine
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More Information: Here

Bookserve
Capsule Review: Simple referral program; limited number of graphics available. Note that there is no search form for you to add to your own site; you can only link to specific books. Weekly stats.
Payout: 5% on books listed at 10% off the publisher's price; 10% on books listed at 20% off the publisher's price. Paid on all books bought during a session, not just on the linked book.
Help: Very small selection of graphics
Rating:
Return: or (see Payout section above)
More Information: Here

Cherry Valley
Capsule Review: A site specializing in books for children and young adults. If you have a similarly targeted site, then why not join their affiliate program.
Payout: 8% of all sales; 15% of all sales to a new visitor (somebody who has never visited the site before)
Help: Unknown
Rating:
Return: (all visitors) or (new visitors)
More Information: Here

Computer Literacy
Capsule Review: A site dedicated to computer and technology books, and an affiliate program with a difference: a flat-fee payout for each new customer. Great if you can send hundreds of people to buy a book; not so good for sustained income.
Payout: $10 per new customer
Help: Search engines, banners (at least one is mandatory), recommended lists and more
Rating:
Return: Difficult to judge against other programs. For comparison, a $10 bounty for a new client is roughly equivalent to the income you would receive from somebody purchasing $200 of books from Amazon.com. However, you only get paid the first time the customer buys books.
More Information: Here

Intertain.com
Capsule Review: Online bookstore that features a half-price area. No branding required (no need to display name or logo of store on your own site). Links can be provided back to your own site.
Payout: Complicated scheme. Essentially 10% of all books purchased in any calendar month; however, if this comes to less than $25 (i.e. sales of $250) then the earnings for that month are zero and the count is reset.
Help: Unknown
Rating:
Return: 0 (for sites that fail to meet the $25 monthly minimum) or (for other sites)
More Information: Here

Powells
Capsule Review: Powells sells new and used books, and even buys back books in good condition at 30% of the resale price (subject to certain conditions)
Payout: 10% of all books sold
Help: Unknown
Rating:
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More Information: Here