Andy, were you going to try doing video with MythTV, and if so what capture device? I have a hacked series 1 TiVo, but have wanted to give MythTV a try.
edit: Wanted to ask as well if there is a linux driver for the 9200 that someone else has written or what you will do there? ATI does not have a PPC linux driver.

Excuse the questions, but I haven't used a Mac since high school, and even then it was just using programs there. I never got into configuration, and the hardware. I am just now diving more into Linux than I previously had with my empeg. (In fact tonight I start a new Linux class at my college with a RHCE

)
edit2: Oh!!! I see now you can run MythTV on OS X. So that negates the first edit, but the first question remains.