If anyone knows of any Live CDs of Mythbuntu, LinuxMCE or any of the other media center distros please speak up.

I've googled around a bit without any luck, but perhaps someone knows of disc that one of the linux magazines created?

KnoppMyth can run the Myth frontend from CD, but I don't know how you'd run it as an all-in-one since everything is configured in the mySQL DB, and the only way to do a complete auto-config is to use a known hardware reference platform (like the Dragon for KnoppMyth).

http://geexbox.org/en/index.html

Yep Knoppmyth works dandy for a frontend but for a recording backend, I don't see how it would be reasonable.
-Trouble