Didn't you check my Twitter status?

Duncan Mackenzie created a mash-up between twitter and your xbox.  Now your friends can see what you're playing from your twitter account.  What is twitter?  It is a community that answers the question, "What am I doing right now?".

Duncan used the twitter API and I'm not totally sure, but possibly Windows Live Alerts.

Who doesn't want to know that I'm playing Halo 3 for the past 32.9 hours?