Dan,
see what you CN's trawl brings as well, but perhaps check here:
http://www.stark-labs.com/nebulosity.html
My understanding is that Craig is a great guy to deal with. I don't use it though, but am thinking of perhaps trying it. Not sure if it helps with focus, couldn't see that in the list of features.
You would plug the iPhone to the camera? How? With a mini to RCA perhaps? Hmm let me try that and get back to you. There is a couple of guys in NZ writing software for the iPhone.