I plan on dnl iso's of fedora for the ppc. I have it on an old dell pII that I have configured as a (headless) server with FC4. I administer it by ssh and vnc from my tibook. I would put it on my powerbook now, but I don't have enough room on my drive (too much junk that I need)
. I tried the ubuntu live cd, and it worked well on my tiBook.
I teach at a school (we're on vacation right now) that has some old imacs that it would fun to experiment with. I'll try to let you know how it goes.