Just saw an article on FiringSquad and it was about gaming while running the AeroGlass interface on Windows Vista.  I was thinking with all the new eye candy this brings in the performance hit would be huge.  Well from what they saw there is no hit.  It seems that the OS suspends the AeroGlass interface when you go into a full 3D environment.  Seems like MS did something right for a change.  Here is a link to the article.  FiringSquad