I've mentioned SapphireSteel's Amethyst Visual Studio plugin-in previously. SapphireSteel has just announced the availability of Beta 5 which, among other things, adds refactoring support, improved debugging, and more. If you are a Visual Studio developer who also uses (or wants to use) Flex, this one is worth a look at.
Oh, this one is just too cool! Tour de Flex allows users around the globe to experiment with Flex code snippets and examples. And I do mean around the globe. Greg Wilson just posted a link to a Flex dashboard which uses ILOG Elixir controls to show a real time heatmap of current Tour de Flex activity. LiveCycle Data Services are used for the connectivity, and a GeoIP database maps requests to locations. Very slick. So slick, that I'll even forgive them using PHP pages on the backend instead of ColdFusion (just this once). ;-)