What's a good site to read book reviews??

I wanna find out what books are critically acclaimed, and how popular books rate, but I don't know if there are any sites that measure this.

Is there a book version of Rotten Tomatoes?

For quick reviews, Amazon.

For quick reviews, Amazon.

Pirate700

agree.

For quick reviews, Amazon.

Pirate700

http://www.shelfari.com/

http://www.librarything.com/

The AV Club does a good job reviewing new stuff

http://www.shelfari.com/

http://www.librarything.com/

WolfattheDoor34

Goodreads.com, and Amazon