Here's a build for local LVDS LCD panels (Laptop LCD) and Analog VGA, with Xenarc 800x480 timings.
Chipsets:
855GME
915GM
945GM
Package:
http://moschini.org/ALL-LVDS-VGA-800x480-Xenarc.zip
All the other chipsets don't have LVDS ports on the chip - use this one instead for Analog VGA only:
http://moschini.org/ALL-VGA-800x480-Xenarc.zip