Just as I start blogging, the pack starts microblogging. Those in the vanguard were using Twitter last year. I simply don't want to be that available and that public all the time.
The NYT had an article on microblogging again. In the workplace, with Yahoo IM, I did find it useful to have a short, custom status message that I changed during the day to let remote folks know what was going on. Twitter seems to offer the same idea, with a one-to-many blurb for those who follow.