But what really drives me nuts is textbooks. The data is practically handed to them with ISBNs. How hard could it possibly be for someone to tweak the algorithm so it doesn't suggest to me every edition of every text book I've ever purchased? Beyond the customer annoyance factor, this is a business issue. There is a virtually 0% chance that any textbook suggestion will be converted to a sale. That takes up valuable suggestion real estate on the user's screen and keeps me from seeing a suggestion that I might actually be interested in buying.