Hot on the heels of the Windows 7 beta release are updated video drivers for Radeon cards:
ATI Radeon HD 4000 Series GPUs
ATI Radeon HD 3000 Series GPUs
ATI Radeon HD 2000 Series GPUs
ATI Mobility Radeon HD 4000 Series GPUs
ATI Mobility Radeon HD 3000 Series GPUs
ATI Mobility Radeon HD 2000 Series GPUs
AMD 780G Chipset
AMD 780V Chipset
AMD 790GX Chipset
I also suspect you can still use the Mobility Modder to add in missing PCI IDs if your card seems to be unsupported.
You can download them from
here.