Favorite Interactive Site

Lately I've been going to a site called Reddit.  It is a user generated news site/message board where people vote on the content they like, and in exchange, it makes the main page.  It's a great way to pass time, and I also learn a lot of new stuff I wouldn't otherwise of bothered checking out.  The design of the site is very simple, and doesn't contain a lot of graphics making it easier and quicker to read once you get used to how it works.  Close second, http://www.zombo.com/.  You can do anything at zombo com