What else?

UPDATE:

http://www.seroundtable.com/archives/017586.html

    * Digg
    * Delicious
    * Twitter
    * Plurk
    * Linkedin
    * Flickr
    * Facebook
    * YouTube
    * Gmail account
    * Yahoo Profile
    * MSN profile
    * FriendFeed
    * Bebo
    * MyBlogLog
    * MySpace
    * Netscape
    * Pownce
    * StumbleUpon
    * Niche social sites (aka Sphinn)