This looks like one of those things that might make your Pocket PC more appealing to carry around. Mean Hamster Software has released Myst for the Pocket PC, at a cost of $24.95. There're screen shots at the link, but sadly no system requirements (at least, that I could find) or a demo version.

This was, years ago, my favorite game. I think I've forgotten enough about it to play it again :-)

(Via PDABuzz.com.)