Hi on recent snooping of nvidia ftp site i discovered these new vista beta drivers 87.15 dated 22 feb 2006.
So im pretty sure there the newest.

x86 = ftp://download.nvidia.com/Windows/vista/b...e_vista_x86.zip
64bit = ftp://download.nvidia.com/Windows/vista/b...e_vista_x64.zip

I tyed installin it in 5270 and it just crashes so i guess its for 5308.