If you are working with and application that contains heavy ActionScript then
this tool might be useful to you
Its free

More details in macromedia.flash.handhelds forum, there look for thread with
title "Flash Debugging tool"

[L=Thread link on
macromedia.flash.handhelds]http://www.macromedia.com/cfusion/webforums/forum/mes
sageview.cfm?catid=195&threadid=769093[/L

I have updated Flash Debugger. One user have reported that the first version
has 3000 max lines limit.
In this version user can save debugging session to a text file and no 3000
lines limit.
Small memory foot print.
This tool is ideal for people working with large size flash projects.
Follow the link on previous post to download Debugger (FlashDebugger2.zip).