Macromedia Flash Client for Linux?

Darrell Townsend writes "I'm a web developer, and I'm getting tired of having to switch between Windows and Linux to develop in Flash (or use some type of emulator). Are there any programs out there that I can use to develop Flash natively in Linux? (I'm not interested in any of the xml2flash-type programs, I want a full-featured IDE for Flash like that available for Windows/Mac.)"