There is no official ppc build of Handbrake 0.9.5. Following the wiki compile guide, it is possible for compile it on your own ppc box. Or if you are to lazy, you are welcome to download the ppc binaries I compiled. It works, but it’s not getting faster.
Just installed the latest Ubuntu (10.04 LTS) on an old iBook G4 (1.4 Ghz, 1Gb Memory) and everything worked out of the box :) It feels alot faster than OSX :) Not sure if I’m gonna keep it running Linux or re-install Leopard.