The Internet Archive has launched a demo of the Open Library, a project that seeks to gather all the information about all the world's books and make it publicly available as a giant books wiki.Link (Thanks, Rick!)
While many books are making their way online for free access, most still are restricted or cost money to touch. The Open Library combines links to open resources with information on in-copyright works and enables you and me to review, annotate, correct and convene.
I think this project (which right now seems to point to almost half a million books) is very cool -- it's going to be a major addition to the world's open cultural infrastructure. I have a hunch that it's going to be the primary way many if not most people access books, and I see it becoming an always-open window on the desk of every librarian.
Aaron Swartz led this project, which was conceived by Brewster Kahle -- please send them support, critiques and book databases!