I no longer see why people want to run Linux on an Xbox. When it first came out, the Xbox was a great deal, as far as computing specs and price go. But now you can find some good deals, and build a similar if not better linux box, for about $200. Even the linux kit for PS2 isn't a great deal, the console and the kit together cost $400, and you'd need to re-compile everything you'd want to install on it. The only advantage to the PS2 linux kit, is that you game do some game developement.
Just buying a cheap PC is better then linux on consoles for computing purposes.