Erm intel chipsets are missing the GL_ARB_Fragment extension so I don't see why anyone would be wanting to use vista on intel. I have the same problem with my macbook and beryl, I just can't get the hardware to do the blurfx so that means the aero glass effects are out for vista too. Well unless they use a horrific GLSL software rendering technique, which I've seen in some examples but this is extremely heavy on CPU and the quality just isn't there.
I think nvidia will win out for vista and linux in the short term, unless intel come up with that brand spanking new graphics chip they've been hinting. Intel on Linux is still cool though, open source drivers and all ;)