Dr. Flubber emailed me a nice little hack he came up with. Basically its an MRTG config file that records and graphs xbox temperature information, and here it is (Developer/Misc). Read the README for more details! I've made a nice and simple installer for it (included - install.sh).

You can see an example of what this script outputs here: Temperature Graph (Or you can click the new "System Graphs" link on the left!!).

Enjoy!!