I just wanted to pass on a huge kudos to the Air team. We just released our first product (a free iOS Web Simulator for Windows) built using Air 3 and the captive runtime (release version). Tons of downloads, and not one singe report of an installation issue. I know the captive runtime isn't a panacea, but being able to whip out a simple install script, and an exe/app with no dependenices and some determinism regarding the runtime is very nice indeed for our use case.
I made sure to put a "Built with Air 3" link on our download page too
Really looking forward to Flex 4.6 as well, good time to be an Adobe dev!