Rachel Singer Gordon of The Liminal Librarian is giving away free books to libraries that she received as review copies. Some strings are attached, but little to no money is involved.

Free Computer books http://www.lisjobs.com/liminal/2007/04/computer-book-giveaway.html

Free Library-related books http://www.lisjobs.com/liminal/2007/04/more-free-books.html