If you read a lot of books, you know the problem: Where do they go? Did you classify your copy of Just for Fun in biographies, computer science, or science fiction?

Do you really classify books? Who are you anyway? Sheldon Cooper? And, if the book's not in your bookcase, did you lend it to someone or is it propping up a table somewhere? If you're not a librarian with OCD, you'll probably have to ransack you whole house to come up with that elusive paperback title you so desperately want to reread.

It's pretty much the same with e-books. They're guaranteed to reside within the four metal walls of your computer, but trying to find them on the hard drive, because of the pure volume and disorganization of your collection, will not be how you want to spend your Sunday afternoon.

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