I have used Margi's Presenter-to-Go, available at
www.margi.com for $199. They provide a compact flash card, cable to connect to the projector, an IR remote that works great and software. I use it for powerpoint but it also has a mirror program that will project whatever is on the pda screen. For powerpoint, the software places an icon in your pc's powerpoint software that when clicked renders the presentation into the format that the pocket PC can understand. While the resolution is execellent, pictures come out with a modeled look.
I used it twice a week for client seminars for about six months now and have been extremely happy with it. It sure beats lugging the old laptop around for seminars and is a much quicker setup.
Good Luck!!