FriendFeed popped out of nowhere for me.  I hadn't heard or seen of it until I saw a blog post from Robert Scoble.  With so many networks out there like Twitter, FaceBook, Flickr, etc. it's sometimes hard to keep track of all the people you follow.  FriendFeed helps out by displaying what exactly your friends and contacts are doing on other networks.  Once you signup (it's free), you just add as many of your own services as you like, and there are quite a few, and get connected with your contacts.

The interface is nothing fancy, but it serves its purpose well.  A clean way to view the activity of all the people you are somehow connected to.  I think tonight I got all my relevant services listed, so I think I'm all set now.  Feel free to add me to your FriendFeed list.

Link: http://friendfeed.com/sscott