http://twitter.com Generally speaking, it's sort of like an online status indicator, or a micro blog. If you're an IM user that's ever changed your name to reflect some activity that's going on, it's that, with archiving, RSS Feeds, and your standard "Web 2.0" fare. Blog posting too much effort? How about a one liner status update? Add friends, and watch what they're up to. Or work to have something useful to say in comparison. "Fixing a bug", or "Fixed it". Could this actually be a useful "Web 2.0" tool? Discuss.