It just occurred to me, the next version of Windows, codenamed Longhorn, is supposed to incorporate a lot of DirectX 9 accelleration into the OS itself; though that's going to be something like 2 years before the OS is released, and probably another year before it really gets saturated into the market. And there's of course no conclusive facts and probably no good speculation as to how demanding Longhorn will be (though I doubt not very demanding, that's just my hunch based on pure intuition).