Yessir, FAMES to the rescue!
You see, there's this neat PHP plugin for Eclipse called PHPEclipse that comes with a web browser view. ASUnit's UI is a SWF that uses LocalConnection and so you can load it into the web browser to integrate it with Eclipse. This ingenious technique comes courtesy of Sonke Rohde who used it to integrate the Net Connection Debugger into Eclipse.
The acronyms they keep a-growin'. I started out with AME (ASDT, MTASC and Eclipse), got the Flashout plugin working and entered the world of FAME before getting my Borg on and assimilating _root. I knew I was well on my way to open-source Flash development but there was still a piece of the puzzle missing: How do I create my initial SWF, its library, resources, etc.