We made our own comic-viewing iPhone App and our first comic, Moments of Elation, is available in the iTunes Store! For free! We've reformatted the story for the iPhone, so reading it is a whole new experience. Just search for "Carpe Chaos" or "Moments of Elation" to find it.
We tested it on all 4 versions of the iPhone, the iPod touch, and the iPad, but please let me know if you discover any bugs, or anything else!