I opted to use Adobe Air for a new project a year (or two maybe) ago. At the time Adobe's was making lots of waves at the speed of their JIT compiler and support for platforms like Linux had improved (at least slightly). Now I'm thinking Adobe just hasn't delivered on any of the promise it showed back then. I think they have themselves to blame, and there certainly seemed like there was a time when Apple really wanted flash on the iPhone and they just didn't deliver.