If you are a reader and like to talk about the books you read with others, you might be interested in a brand new kid on the block called Revish. I've been one of a handful of folks helping Dan Champion, the founder of Revish, test the site for the past week. Since Dan is a web standards Guru, this site is sure to be accessible and usable.
Revish is kind of like your local book club combined with the book section of the newspaper. As a member you get to write reviews, list the books you are reading or have read. You can also comment on reviews written by others. What makes this place different, among other things, is the quality of the reviews. If you write a review you are asked to follow a set of fair, but definite guidelines as to the length and depth of the review. No "I liked this book, it was good" for Revish.
If you're interested, head on over to www.revish.com and sign up for the beta. They are going to invite more people to help test the site, so if you're interested, don't delay.