I tried readernaut but felt it did too much. I just wanted a minimal way to keep up with what I've read, not add reviews (that's what Amazon is for), add friends (we all use Facebook, right?), or create lists.<p>There's also <a href="http://goodreads.com/" rel="nofollow">http://goodreads.com/</a> and <a href="http://www.librarything.com/" rel="nofollow">http://www.librarything.com/</a>