For anyone interested in writing a game for the iPhone, I thought that I'd try to journal some of my experiences developing Pathology.
My sons and I regularly play board games with friends, and someone brought in a game called Tsuro, which my sons really enjoyed playing. I took a look at the game, saw how simple the rules are, combined with deceptive strategy and depth, and I thought "This would be cool to play on the iPhone." I had also been looking into the iPhone APIs and I saw a good fit. I could leverage animation along a path as well as touch/drag, and the core of the game was born in my head.