I've been playing with Vista Beta 1 over the past few days, and although I can get it working reasonably well on my Dell Latitude D600, I've pretty much given up on my Dell 5160. Unfortunately, there's no LDDM drivers available to enable Aero Glass on the D600, but there was one thing I did notice - the default settings for sound under Vista Beta 1 is not set to full acceleration as you would want from a client operating system. Very simple to fix - click start/run dxdiag. On the sound tab, drag the Hardware Sound Acceleration Level fully to the right - Full Acceleration.