Brother Zuzu writes: "Seadragon, the predecessor to Photosynth, by Blaise Aguera y Arcas, has been ported to the iPhone! (The battle of the Zooming User Interfaces is on, between Microsoft Live Labs and Apple's own Core Animation.)"
Seadragon is a free download which makes it possible to view gigapixel images on a small screen.
I will simply echo my comments from when Google Earth was release on the iPhone first: "Hurrrr durrrrrr huh?" (I'm not positive this is exactly what I said.)
When two of the three major competitors to your smartphone platform are releasing their experimental or cutting-edge software on your platform, something is going wrong — for them.
Seadragon Mobile download [iTunes]