how in the heck did you get a 1.66ghz G4 to play youtube?
I have a 1.9ghz G5 and it doesnt play youtube worth a crap. and my 1.25ghz G4 ibook isnt even watchable. you have to let it download all the way or it gets stuck ont he first frame. and when its done downloading, it plays VERY slowly. put put put put puttttt 2FPS.

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Hmmm. Yes, YouTube sucks, and even on a dual core Atom it doesn't play at full frame rate. What might help quite a bit is ClickToFlash which is something I recommend for all machines, but which is particularly useful on older and slower machines. It gives you the option of watching most YouTube videos as h.264 which, while CPU intensive in itself, works better than Flash playback on more modest machines. You get the benefit of that PLUS you don't have to worry about your CPU getting tied up with all the extra Flash crap which slows things down everywhere.

In addition to ClickToFlash, you can also get this:

http://www.verticalforest.com/2010/10/27/youtube5-version-2/

It's a Safari plugin which seems to work better with YouTube than ClickToFlash sometimes. I use both - ClickToFlash to not allow Flash to load at all, and the YouTube HTML5 plugin to make YouTube videos work well.

Let us know how it goes!