But I signed up for it anyway.
If you're connected to me on Facebook (which I've been keeping pretty much friends-only, btw... in case I turned you down), then you've noticed that I've been obsessing over the whole "I'm in ur (noun), (verbing) ur (noun)z" cat thingy. In fact, I'm so obsessed with it, that I just secured iminur.net. I don't even know what I want to do with it yet.
In any case, the idea of away messages that are freed from the IM client and universal is interesting, and so I thought I'd give Twitter a try. I think they have a long way to back into a whole social network or business, but it's an interesting concept.
Actually, though, if I were AIM, I'd just break the status messages out of AIM and allow people to place them as a blog widget and change them from my phone... they're well positioned to do this.