The latest shiny new thing on the block is FriendFeed. While many people are describing it as yet-another-social-network, in fact I would call it more of a friend aggregator.
Unlike MyBook and FaceSpace type services, with FriendFeed you add your various social media accounts, Twitter, Blog, Flickr and so on, and your friends can follow all your activity in one place. You follow others to do the same.
Yes, if you are following someone on Twitter and subscribe to their blog, you already get much of this content, but the nice thing is for anyone who up to now you just knew as a blog author, you get to see more of their world and personality. More three dimensional. For example you can see pictures of their latest trip, see what music they are listening to and what they just bookmarked.
Obviously not something you are going to want to spend your entire day on, but still worth a look.
You can follow me at my usual account name 🙂