I added Inner Circle on Facebook the other day and have been working with the developers to iron out the kinks. It's working now and I have found it to be a great tool to tame the growing circle of friends.
It allows you to create circles of friends that you pick for whatever reason and keep updated on their updates. None of your friends can see your circles and only you benefit from the application. There is even a feature that I haven't used yet called "Shout" that allows you to interact with each circle and begin a conversation. It looks promising.
I know I've said it before but Facebook truly is the most elegant web tool I have found to keep people in touch. It's effortless. I think Inner Circle is Facebook 2.0 and is going to make the effortless interaction of Facebook even sweeter.
Oh, and if you aren't using Facebook, why not? You obviously are reading blogs so you're online friendly - this is the next level. Really. Yes, I have drunk the Kool-Aid. I am a convert. Resistance is futile. You will be assimilated...