It's been 7 loooong days but I have finally got my xBox to boot Gentoo Linux as a diskless thin client using Etherboot. The only problem which remains is that there's a problem with my kernel which means that interrupt 1 is being allocated to something and causes the USB initialization to fail. I don't think that this problem should be too difficult to solve, since it has been done before in the past, and I'm just hoping that one of the xbox linux kernel hackers points me in the right direction so that I can fix it.
I'm planning on using the xBox as a dual booting regular xBox games console and also as a mythTV frontend.
Have you installed mythfrontend on an xBox?