A website that lets you search the catalogs of many independent booksellers for rare, out of print, and unusual books.
A search engine which indexes where you can purchase over 150 million rare, out of print, new, used, and import-only books online.
An archive of free-as-in-beer science textbooks, course material, lecture notes, and whitepapers for anyone to download. Updated fairly regularly. Contains material on physics, computer science, chemistry, medicine, astronomy, engineering, mathematics, and more for students of all ages. Even some material for elementary school.
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Rice University is releasing under a Creative Commons license college level textbooks written by professional textbook writers. The texts have passed through a peer review process as well for vetting and fact checking.
A blog of free and open educational and cultural resources from around the Net.