Google starts “My Library” at Book Search

Google Book Search’s “My Library” feature could be another free contender to LibraryThing with the added benefit of being able to search your custom library’s book texts.

http://googleblog.blogspot.com/2007/09/collect-share-and-discover-books.html
http://booksearch.blogspot.com/2007/09/my-own-library-on-book-search.html

Reader2.com or BiblioPhil.org have more capabilities, and both are also free, but that text search capacity is darn nifty.

LibraryThing still appears to have the best interface and functionality of all. So in the case of social library databases, I think you get what you pay for.