"Rotten Tomatoes" for Readers

For years now, movie goers have delighted in a unique interactive website known as Rotten Tomatoes.  The concept is fairly simple: movies are listed on the website, users can log in and rate the movie giving it anywhere from 1 to 5 stars and leave comments. Movies are then given a rating on the "tomatometer" (cute, huh?).
Anywho, there's a new website that serves a similar function for readers called I Dream Books.  The rating system is a less original "readometer" and the graphics less exciting (little smiley clouds? Really?), but you'll also see critics reviews on the main page for each book, and when you log in, you can also create a "to read" list for yourself.
Not quite as much fun as actually hurling a tomato, but useful for those of us who find ourselves quite unable to stay on top of everything we think we want to read.
Happy reading!