Here are some news from ZodTTD:
The number one request I've gotten for gpSPhone has been to scale the screen larger. I decided for the next release I will do just that, as well as improve sound support. I'm debating whether to add landscape support since it's very odd to hold the iTouch / iPhone sideways. Instead I rearranged the skin for portrait mode. Also take note in the screenshot below that making the tiny GBA resolution any larger than below would make things very blocky. So there's less a need for fullscreen or landscape now. I also added n A+B button in the very bottom right corner (not shown in the skin).
Read more about Want to be a gpSPhone v0.1.5 Betatester? (iPhone misc)