I love the online book communities. I've done most of them at one time or another and my favorite is always changing. For the longest time nothing could beat Shelfari, but Goodreads has finally taken the lead. Of course, I think the only reason is may have taken the lead is because I can add widgets of what I'm reading to my website AND set updates to my twitter! And with all the playing I do in the book world this is a huge time saver for me.

Admittedly, I haven't been keeping up with it very much lately, but here is my Goodreads account if you want to see it.