I've been playing around with YT this evening on one of my Cubes. This is my bare bones basic, 450mhz model. It does have 1.5gb of RAM and a Radeon 7500 driving a 22" ADC Cinema. I haven't(yet) installed Leopard, but it runs Tiger fairly well.
In any case, it's connected directly to my router via wired ethernet. In TFF, Youtube is actually useable-if not totally pleasant. I've found that the key is to let the video load for a minute or two before trying to play. Otherwise, it stutters badly(on the video, not usually the audio). Once loaded-i.e. if replaying a video, it's about 95% okay.
I wanted to play around with my Sawtooth also, but booted it up to find 96mb of RAM in it
. I think that the last time I booted it up, I was using it to sort RAM sticks, hence the collection of random small stick in it(it has 3x62).
I need to order some more SDRAM-I need some 512mb for several computers, and some 256s for my B&Ws, beige G3s, and Yikes!. Funnily enough, PC-133 is usually cheaper than PC-100-that's fine with me since having to stock one RAM speed makes life a lot easier.