This page describes the status of the Debian Port for ["PowerPC"].
Older models work without any problem.
The new model have some issues to be solved:
Sleep-to-RAM still does not work. BenH is working on it. Sleep-to-disk does work with 2.6 kernels.
It does not work and probably it will never work. It uses a Broadcom chipset and information has not been disclosed to create an Open Source driver.
One button mouse
On iBook G4, editing mouse.sh with
echo 0x61 > /proc/sys/dev/mac_hid/mouse_button2_keycode echo 0x64 > /proc/sys/dev/mac_hid/mouse_button3_keycode echo 1 > /proc/sys/dev/mac_hid/mouse_button_emulation
makes the Fn-CTRL and Fn-ALT combinations behave as a middle and right button.
There is a lot of information on the [http://www.mathematik.uni-marburg.de/~schmidtm/apple/ Powerbook G4 12" install HOW-TO] by Matthias Schmidt