I jumped onto the Goodreads bandwagon too! Joined the MR group and copied over my books from LibraryThing. So far I love how easy it is to add new books and even picking out the correct edition for my 1970's versions of Narnia books wasn't too bad. I love that as long as I the ISBN I can track down the exact version I want even if the search box only says "Title or Author."
I'm slowly trying to add the MR group to my "Friends" but Goodreads has a very small number of friends I can add in a day. Also, *some* people have tricky challenge questions... air speed velocity of a swallow?????