9rules just underwent a massive redesign and feature addition. Codenamed "Ali", the new site's most interesting feature for me is called my.9rules. Users can have custom profile pages that aggregate their flickr photos, last.fm plays, blog posts and more. However, the new 9rules isn't trying to be a social network, it's about making it easier to find great content in the 9rules network and find it fast.
There are far too many new things in Ali for me to personally explain so be sure to check it out yourself.