I will tell you about GoodReads. Really the site is addictive. It is almost as good as going to the library. The only downside is that you can't grab the books of the computer screen. Especially when my library it turns out my library does not have it. :(
If you have not tried GoodReads you should. Especially if you are a major book lover! It is book lover heaven! :) I can't believe it took me this long to find out about it!