I have been trying to stay away from all things 'i' but the iPad has got me interested a little, would gosu be able to deal with this? Is it just iPhone but bigger?
I think I fixed it by making Graphics aspect-ratio agnostic. Time to make it a bit more comfortable to run the same code base on several resolutions I guess. But at least now it's cleanly possible to check for Gosu::screenWidth and Gosu::screenHeight and then create a window using the correct sizes :)