My first widget was an ultra-simple Xbox Live Gamertag widget, which was basically a straight port from the Windows version. Aside from the preferences, which are now on the “back side” of the widget instead of a fly-out panel, not much is different.
The second widget is a bit more complex - it shows the current challenges available in Halo: Reach. Every day (and week) there are new challenges players can meet in order to get credits to buy in-game armor. This widget helps keep that info a keypress away.
Anyway, if you have a Mac, please head on over to my Dashboard Widgets page and give them a shot!
Update: Since Bungie has discontinued their Reach site, I've removed the Reach gadget.