Trace and debug ActionScript from your browser
How many times have you built something in Flash, tested it a million times or more, have it work great, and then fail as soon as you put it online, or outside the Flash IDE ? I've often wished that there was some way to trace out what's going on in my .swf files online, so I can figure out what's happening.
You can downlad Vizzy Flash Tracer. It's free! Don't forget to download and install Flash Player Debugger. Make sure you download the firefox version (Flash Player Plugin content debugger for Netscape-compatible browsers).