For those talking about YouTube performance on PowerPC, have any of you tried ClickToFlash with the latest Leopard-Webkit release? It allows direct playback of h.264 video natively when available, bypassing flash and poorly-optimized HTML5 players completely. I've had very good luck with it on my trusty 12" PowerBook G4 (1.33), I'd recommend it to anyone trying to play back internet video on a PowerPC machine.