I recently installed MintPPC 9.3 on my 17in Aluminum Powerbook. I must say, this is by far the smoothest Linux install on this system ever. I have run Yellow Dog, Ubuntu and Debian Lenny, Squeeze and Wheezy on this machine in the past -
Previously, Debian was my favorite distro. However, I had a bad experience with radeon drivers on Wheezy... (KMS on or KMS off - I just couldn't get hardware acceleration to work... no xorg.conf setting worked either - I have come to the conclusion that the radeon rv350 is just bluntly broken on Wheezy). It was time for a fresh install.
So, I decided to try MintPPC 9.3. Everything worked from the start with no tinkering. I didn't even need to disable KMS - my radeon rv350 just worked. My broadcom wireless airport card also worked. This is the first time I have ever installed any flavor of gnu/linux and not had spend a couple hours editing config files!
So far the only "issues" that I have encountered are:
Problem: The battery applet in the lxde panel just does not work.
Solution: install wmbatppc
Problem: Caps Lock light was broken.
Solution: uninstall mouseemu
Problem: Touchpad multi-touch did not work and there was insufficient config tools in the DE.
Solution: Edit /usr/share/X11/xorg.conf.d/50-synaptics.conf
Problem: Dvds would not play
Solution: install libdvdcss2 from deb-multimedia repository http://deb-multimedia.org/
I would also like to add that MintPPC delivers the best performance I have ever experienced from this machine (including Apple's OSX). Excellent job!