I just picked up an xBox360 a couple weeks ago, and finally this past weekend I got to use it. One feature of the xBox360 is that it tracks your progress in the games you play and displays them on the web and right in the xBox.
Microsoft has been kind enough to allow people to create widgets and other websites to show people’s game information. A user on the popular Dashboard widget site created a Gamertag widget, and I use it myself to get a quick overview of what missions and other various accomplishments I’ve had.
You can download the widget here.