How's OSX run on your machine? Specifically im looking at Core Image effects (transparencies, etc), Front Row interface, iTunes visualizers, and screen savers as well. I'm trying to get a sense of how much a lack of an onboard GPU makes a difference to the OS experience, as I've got a friend who's looking at getting a Vista capable computer - but as it's been mentioned, to even use any of the Aero effects in Vista you'll need a dedicated GPU as well. So in that regard, I'm curious how the lack of a GPU would translate in the OS X world. Any thoughts on OS X performance on a MB? Thanks!