SapphireSteel has announced the release of Amethyst, their Flex, Flash and ActionScript IDE for Microsoft Visual Studio 2008 and 2010. Check out the features and the introductory video. If you are a Visual Studio user, Amethyst may be exactly what you need to bridge the worlds of Flash and .NET.
On a personal note, I've been in regular contact with the SapphireSteel folks as Amethyst has evolved. This project, especially the Amethyst Designer, was an enormous undertaking on their part. And so to Huw Collingbourne and the crew at SapphireSteel, congratulations on reaching this milestone, and thank you for this important contribution to the Flash and Flex world.