I have been looking at Adobe Flex/AIR as a cross platform application delivery/hosting environment. The thing that I like the most is the ability to put my applications in front of Windows and Apple users. I come from a Microsoft development environment and some of the methods Flex/AIR uses for UI, database, security don't sit well. Don't get me wrong, Microsoft has its issues as well, I'm just used to them and I am now trying to look beyond.