Yeah, I'm still not convinced that it's desirable on the personal level but I think it has potential as a mini-RSS reader/news ticker. Personally, I don't feel the need to know what my friends are doing every minute of the day but the occasional update on some project I'm interested in works for me.

Ultimately, it's about the content but it's hard to say whether Twitter content will become more than trivial updates on people's whereabouts. The short message size does seem to encourage it but we'll see how it goes.