I just discovered LibraryThing. I had been cataloging my books in Google books. I imported the Google list into LibraryThing. Right now I am placing books into both catalogues until I decide which one I like the best. I like Google because you can search your entire library for specific information from books in your library. I also like the fact that you can import several books at once by using the ISBN. I have had some trouble with Google books in that I will search for a particular book in my library and Google books says I don't have it when I know that it is there. I like LibraryThing because I like the idea of seeing what books I have in common with other members and peeking into other peoples library.