Xbox Linux Cluster
aeiz writes "Adam Cecchetti put together a Linux cluster using 3 modded Xboxes and was quite surprised with the results. He used the Mandrake Linux distro." illumin8 summarizes Cecchetti's conclusion after investigating "the cost-effectiveness (or lack thereof) and trouble involved in setting up a 3 node Linux cluster based on the Microsoft hardware. The end result: A cheaper Walmart PC would perform better at the same task."
At least in Australia, plenty of people seem to be giving them away for free as prizes, or whatever. (Presumably M$ are trying to prime demand for games...)
If you got one at no cost it might be good to try something like this.