I found Twitter today by checking out Wil Wheaton's blog (wilwheaton.typepad.com). His blog has been "broken" for many months, but I believe he's permanently over on TypePad now.
Twitter is mini-blogging: kind of an instant updater for you and your friends..."Life between Blog Posts" as it were.
As for me, I just got back from Dallas and I'm pooped. More to follow sometime.
Be good, be safe, and all that crap.