FriendFeed is a cool new site that aggregates you and your friend’s recent activity on numerous social networking sites (and even things not strictly considered social networks). Its nice because its a newsfeed that integrates all those minor pings your friends post and lets you keep up with them in an easy-to-read chronological way.
Do it now before I have to turn you into an imaginary friend.
Rand Wacker 
Ha, love that line – “Do it now before I have to turn you into an imaginary friend.”