I just watched a video on YouTube of the AIR iPhone application with Ribbit's VOIP Flex Component placing and receiving calls. Who needs a real iPhone when you can just fire up an AIR app and talk all you want?
Seriously though, there is some very cool stuff going on with AS3, Flex, and Flash these days. I can only imagine where this will go if Intel and Adobe do indeed get AIR running on mobile devices. It could have the potential to turn wireless carriers into data-only providers -- mobile broadband services.
I would highly suggest when the onAIR tour rolls through your town you check it out. I'll bet they may even have some more Ribbit info they could demo for you while it is in closed beta.