I'm curious if anyone knows of any developers who now regularly use something like an iPhone/iPad (more likely the latter) to program. I know Paul Graham has written about this stage in the evolution of mobile devices, but is anyone doing it yet? For myself I've played with a Lisp interpreter written for the iPod Touch, but of course it was something of a ridiculous activity. If we can start doing that then I'll feel a bit more "post-PC".