Twitter is rapidly becoming my favorite Internet/Mobile service. Check it out here. You can add the Twitter Application on Facebook so your Twitter Updates flow to Facebook status updates. It's seamless.
I wanted to point out some interesting behavior by one of my friends, Alex Bain. He has been twittering his wedding and his honeymoon. This is extreme lead-user behavior and it won't be for everyone, but when I see the lead-users pushing things even this far, I know the service is a winner. If you'd like to follow Alex on his honeymoon, check him out here: http://twitter.com/a32b
If you want to follow me, go here: http://twitter.com/scottorn
I find enabling phone updates really helps me get in tune with someone's updates, so try that too.