Take Control Books now has account management. See their announcement, “Take Control Accounts Now Provide Online Reading and More”.
Among the more bamboozling features to implement:
* prices per item differ per user depending on which other items the user already owns
* users can claim multiple email addresses to be associated with their account
* the system integrates with Take Control’s esellerate-based ecommerce; buy a book and when you return from your shopping cart you may as a result have new special offers.