I've actually used Vista on a PIII Celeron, 800MHz with 512mb of memory.
The easiest way to describe it is that it can happen, but that it's maybe not the most pleasant thing ever.

With a video card that had drivers to take it above 640x480, it would be fine. (As fine as Leopard can be on a G4 of similar specs, anyway.)

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i ran vista ( briefly) on my p3 xeon 1266 mhz with 512 mb ram and a 512 mb vid card

it ran rather well ( the video card most likley helped a lot ) but i got rid of vista after a few hour i just cant stand it thinsg are chanched not because it makes sense or to make it easier but just for the sake of chance