Adobe Flex 3 Beta
This prerelease version begins a new, more transparent product development process from Adobe, with frequent, regular access to early builds and greater insight provided into the feature roadmap and planning process. The Flex Builder 3 beta release will provide you with an opportunity to explore powerful new features, communicate early feedback, and test existing Flex applications with the new Flex 3 framework. Some of the new major features include:
* Support for the new Adobe Integrated Runtime (AIR).
* Code refactoring.
* Memory and performance profilers.
* SWF file size reduction through persistent framework caching.
* Advanced datagrid.
* Web service introspection.
Downoad the Beta here
Ted Patrick gave a more in depth info on the subject check his blog here.