You created a monster!!! I just created an account and added 117 books! 117!!!! (Granted, a lot of those are children's books I want to remember are awesome for when my niece is born. But still.)
I like it a lot better than Shelfari. The fake bookshelf thing with Shelfari was driving me crazy. Goodreads is awesome.
And, it finally gave me a place to bitch about my love/hate relationship with the Twilight books... and a couple other books that got on my nerves.
Man, going through all those lists of books with cover images was better than flipping through my high school year book.

Though I guess the fact that I had more fictional friends than real friends in high school probably contributes to that a little.