Open Source Flash Debugger for Eclipse
Ralf Bokelberg just announced on the OSFlash Mailing List that he is working on an Open Source Flash Debugger for Eclipse. He has a preview release (.zip) available. Here's a screenshot of it in action. It looks very cool. If there's enough interest, he's going to keep working on it and release it. So, what are you waiting for? Join the OSFlash mailing list and shout out your support!