I've started documenting all the stuff I've done to my TiBook IV, as a supplement to the other powerpc and PowerBook docs (thanks to Branden and Christophe and others). So, I'm not duplicating any effort, but I'm keeping it TiBook IV specific.
You can find it at http://spacepants.org/hw/tibook/ and I'll be updating it as I work out more Debian specific tweaks for my machine. Soon to come -- DVD playback, DVD burning, external displays. -- [EMAIL PROTECTED] http://people.debian.org/~jaq
