I've been thinking for a while about building a simple wargame as a way to try out various new technologies I'm experimenting with. A gamer friend of mine recently told me about Full Thrust, which seems like an ideal candidate. My initial thought is to implement a RESTful back-end using Google App Engine (since it is hosted for free), and perhaps attempt simple front ends in SproutCore, Shoes, HotCocoa, and the iPhone SDK.