CDDB-like Database for ISBN?

ElJefe asks: "I'm currently working on a project that will let students at my school buy and sell used textbooks from other students. For the site, I'd like to be able to enter an ISBN number, and have that bring up all relevant information (author, title, etc.). Basically, I'm looking for something analagous to CDDB or freedb, but for books instead of music. Does such a thing already exists? Are there copyright issues with creating such a database?" ISBN is an acronym for 'International Standard Book Number'.