I have put together a list of the x86 video drivers for the install fest. I suggest that if you can, use a card listed with LLDM after the name as these support Aero Glass.
The list can be found here: http://blogs.technet.com/brucecowper/articles/409228.aspx
I will have a suite of other drivers available and can confirm I have now deployed Vista on a larger range of machines including several SATA controllers (NON RAID), IDE, Adaptec 2940 SCSI and a number of procs; AMD 64 bit process, Intel P4, Intel P3. 4 laptops; Dell Inspiron 8000, Dell Inspiron 8200, Toshiba Tecra M2 and Toshiba M200 Tablet PC.
I am pleased to say that the more I use Beta 1, the more impressed I am in the stability and support.
If you come across systems and drivers others that are not on this list, please feel free to let us all know