From The Gadgeteer’s interview with Marisa Giancarla, who is developing an e-book reader for the Newton OS:
I have not seen the iPhone SDK so I don’t know how it compares development-wise to the Newton, but the lack of pen and ink support and handwriting recognition still haven’t been reached on the iPhone. There is a natural draw to try and compare the two, both being handheld computing devices from the same company, but they are still quite different. I would love to see a tablet device from Apple, then at least the hardware features would be comparable.
I find it awesome someone is still writing new code for a platform that has been dead for a decade. This really shows how awesome the Newton was.