Just my two cents... As a Linux user and developer, I have always hated how the Linux Flash runtime is always seems to be a few releases behind Adobe's Windows and Mac versions, how Adobe's content creation tools (Photoshop, Dreamweaver, CS3, and even Flex Builder) aren't available on Linux AT ALL. It took Adobe FOREVER to produce a decent 64-bit Linux build of Flash. Seeing as how Mac OS is both Darwin/BSD AND Intel 64-bit-based, there is no technical reason it should have taken so long.
I joined this list because my team at work already has a significant investment in Flex, and finally Flex has an opportunity to realize its true potential as a fully open-source technology under Apache's guidance. I will be very happy to see any progress Flex makes away from Flash. If that means moving towards HTML5/js, that's even better. And it's not because Steve Jobs said so. The end goal I want to see is to see a complete Flex development environment that runs on any FreeBSD/Linux distro, produces content that runs in Chrome/Firefox/any-other-modern-browser, (yes, also on Linux) and requires not a single executable byte from adobe.com. I'll be happy to help test Apache Flex on many variants of that configuration for you. :-) tlj