Open Library
http://demo.openlibrary.org/

Open Library will have a graduated accounts system in which users automatically get an account by taking an action on the site, without having to explicitly register. In addition to lots of traffic from Google, it will have a powerful search engine with faceting. It will support tags and user-defined collections, and enable many different types of users who love books to communicate, share knowledge and work effectively together. It will have an advanced book viewer that will handle OCRed text with distributed proofreading as well as transclusion and bookmarks. Books will also be available as print on demand. Anyone can edit the catalog or review or rate or comment on a book. Out-of-copyright books can be uploaded or, through a donation to Open Library, users can fund the scanning of them. The site uses an advanced wiki language to allow users to modify its templates and add new types of data. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This has been added to Reference Resources Subject Tracer™ Information Blog.