Powerbook g4 Aluminum 12.1"

One of my girlfriend's class mates at RISD is going into Furniture. He has to take a CAD class, and the minimum specs for the Macintosh the student's need didn't meet his current machine's... He gave it to me. This makes me extremely happy seeing as I love Macintosh hardware (PPCs anyway). So, while waiting for the OS X disc to arrive in the mail, I figured I would set up some Debian. When the OSX disc arrives I'll backup the boot sector, install OS X, and then restore the boot sector and add an entry for the Berkley Softw--- I mean OSX install.

So the meat and potatoes of this post is: does anyone have any advice for Linux on the PowerPC arch? Any advice on the cohabitation of OS X and Linux? Are there any other *nix's that would function well on PPC?

All advice appreciated.