Library Thing, Etc

I have explored on Shelfari, Goodreads, WhichBook, What Should I Read Next -- all wonderful tools for not only for my personal reading but for patron reader's advisory. I am spending way too much time playing on these...I only have three more lessons that I might be able to finish before midnight. Anyone else out there hoping to slip in under the wire? I liked Shelfari and What Should I Read Next--keeping a list of what I've read and liked. The only complaint is that it eats up so much time. I even managed to add a Shelfari widget to my blog on Blogger!