PocketSlides
If you want to display PowerPoint shows from your PocketPC, the best alternative I’ve found is PocketSlides from Conduits. When you transfer your PowerPoint slideshow into PocketSlides format, it preserves transitions and animations. It also allows you to edit your slides once they are in the PDA, unlike other similar programs. It will work with the Margi Presenter-to-Go and the Voyager Colorgraphic systems for connecting to a projection system.
You can find more info at www.conduits.com. Also check out their really cool PocketArtist program for drawing and painting on your PocketPC!