Sapphire Steel just released a 2nd beta version of the Amethyst, a editing and project management environment for developing Adobe Flex and AIR applications using Visual Studio. Thanks to Marco Casario for pointing me to Amethyst through Twitter!
Amethyst - Sapphire Steels Flex IDE for Visual Studio
That will make Flex development certainly a lot more interesting for .NET specialist and all users of Microsoft Visual Studio. There are already a lot of tools available for building Flex applications, the most prominent probably being Adobe Flex Builder and the Flex extension for IntelliJ. I doubt that any RIA platform will be successful any more unless there are good tools or IDE plugins available for the platforms. Flex has definitely a good number of tools available supporting ActionScript3, AIR and Flex development.
