Just wanted everyone to know that I got MythTV is running on PS3. Just use yum and atrpms, but you'll get a library error. I then had to download the source and compile that code and then manually move the newly created library file to replace the one put there by the rpms.
Currently working on getting my WinTV-PVR-USB2 card going, but it died on me so I have to exchange it in the morning. I did finally get the driver compiled for the 2.6.16 kernel and the kernel saw the device fine until it died.
I've got WindowMaker running to save on RAM. It appears it's saving about 60-70MB RAM IMHO.
Only things I have 100% tested at this point is picture viewing and video viewing. (except for my audio issue just posted) It appears everything else should work, but ymmv. Hopefully once I get everything cleaned up I can write some clearer directions