I have installed MintPPC on my PowerMac G4 (3,5) and have so far fallen in love. It is much snappier than my previous Ubuntu 10.04 install, and I have yet to see any downsides.
All in all, if anyone has issues with PPC's and Linux, MintPPC is the way to go.
Try Preferences -> Synaptic Package Manager
http://www.mintppc.org/files/Screenshot-1.png
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