Universal Game Code Structure

[Mattonaise]

Does anyone have experience with developing Universal games? I am wondering how others would implememt this in their code, as you would need to have different scenarios for ipad rather than iphone or itouch. Also the retina display would require different resolutions of images rather than the old display, so they would need to be loaded instead of the low-res images. Does anyone have any tips or examples on the architecture of their code? Does anyone have different UIViews for ipad or iphone? Would having the data for the game somewhere else and having different UIViews for the device be a viable solution(possible MVC?)? Any tips are helpful.