Surfin' the net I found some new drivers for integrated VGA devices on SiS + VIA/S3 chipsets:
SIS 630/730 2.08a for Win9x/W2K/XP/NT4 - official driver is 2.06
SIS 740/65x 2.09f for Win98ME/W2K/XP/NT4 - official driver is 2.07k
VIA/S3 ProSavageDDR 13.93.62 for W2K/XP
VIA/S3 Twister 13.63.92.1 for W2K/XP

SIS630/730 NT4
SIS630/730 W2K_XP
SIS630/730 W9XME
SIS 740/65x NT4
SIS 740/65x W2K/XP
SIS 740/65x Win98/ME
VIA/S3 Pro Savage DDR W2K/XP
VIA/S3 Twister W2K/XP