Neuroshima Hex!, a post-apocalyptic board game by Portal Publishing has now been released on iPhone and can be purchased for $2.99 from the App Store. I definitely recommend it in both its iPhone and physical form (and not just because it's post-apocalyptic and created in Poland).

Fun fact, aside from the post-apocalyptic theme and the armies being similar to some of the Fallout factions (e.g. Moloch/Calculator, Outpost/Brotherhood of Steel, Borgo/Master's Army and Hegemony/Raiders), there is also another small Fallout connection - at least one of the Fallout developers, Scott Everts, is a fan of the game and created reference cards for it that can be downloaded from BoardGameGeek, and were included in the American edition.