Hey, Will,
All my clients/users are running at least 1024x768. It was about 2 years ago that I was able to get my last set of users from 800x600 to 1024x768. I simply tell people that I design for 1024x768, no exceptions.
Kevin
p.s. I'm Devteach bound in 2 months - hope my new laptop is compatible with the projection unit! ;)