Why would you need such a thing? Well, if you´re always going to book sales and buying bargains only to get home and find you´ve doubled up, take a printout with you! BookDB has a super-condensed print mode so you´ll need a magnifying glass, but at least it´ll save a tree or two.

BookDB also has lending library features. With them, you can add borrowers, loan out books, add multiple copies and so on.