I have a Tecra S3 Laptop with Nvidia GeForce Go 6600 video card (128MB RAM on it) and there is no Aero Glass by default with Vista Beta 2.
1) I downloaded (from nvidia.com) and installed the Nvidia Forceware driver for Vista Beta 2, but there is no GeForce Go 6600 in the list, I choosed a similar one: GeForce 6600 GT
2) I adjusted the settings to the 32bit color depth and 1400x1050 for the builtin LCD display
3) finally I forced to refresh the performance rating (it was "1" with the default SVGA driver, it is "4.3" with the new driver).
And I have Aero Glass now