Kinetic Fusion 2.0 has officially been released, and is very worth checking out.
A quick feature list:
- Full and complete round-tripping of SWF movies to and from XML
- Powerful optimising ActionScript 2.0 compiler with extended semantic analysis capabilities
- GUI and command-line execution that can operate in single-document or batch mode
- Works on Windows, Linux, Mac OS/X, Solaris, HP/UX and all Java 1.4 supported platforms
Yes - that's correct. Kinetic Fusion is both a SWF decompiler (somewhat like ASV), but also a fully functioning command-line ActionScript 2.0 compiler. And the best part is, it runs cross platform because it's written in Java.
If you get a chance, download the 2.0 release and play around with it. I've been using it for awhile now and am impressed with it's capabilities.

For more information, and the "official" press release, see: http://chattyfig.figleaf.com/cgi-bin/ezmlm-cgi?1:mss:117841