You *might* find a driver for it for Geoworks Ensemble
  (shareware version is available - check comp.os.geos for details
  on location), although I'm not 100% sure. There really isn't
  much noticable difference between CGA and VGA and all inbetween
  with DeskMate, outside of a slight crispness improvement when
  you use Herc. vs. CGA. That's one of its great benefits, IMHO.
  *I'm strongly considering buying a Psion 3 palmtop and running
  DeskMate on it, although I need to look more into it, as well as
  check out the HP100LX to see what that's all about.