Most drivers can be found at laptopvideo2go.com.  They have ported the drivers that nVidia provides so that they support the Go cards.

As far as performance - I'd think it ought to do fine.  I'm running Vista RTM on the following setup at home, and it doesn't seem to have any problems.  I don't use it on battery because, well, the battery life already sucked.  It's an HP Pavilion ZD7000 (17" monster).

p-4 2.66Ghz
512mb RAM
40gb HDD
64mb GeForceFX 5200 Go

I'm using the drivers from the above website to enable Aero Glass support.