Open Library

Story from InsideHigherEd.com:

"Open Library is a new online tool for finding information about books – even (perhaps especially) for titles that are out-of-print, scarce, or likely to find one reader per decade, if even that. It is, so to speak, a catalog with benefits. If a text is available in digital format, there is a link. you to it. Citations and excerpts from reviews will be available. Likewise, cross-references to other works on related topics. A user of Open Library can see the cover of the book and, in some cases, search the contents."

SDK