I have to say… if you EVER have to code in AS3 for Flash, using Flexbuilder is just downright awesome. Code completion (that ignore case unlike the Flash IDE), refactoring support, all kinds of goodness in general. Man… even things like searching for references to a particular function throughout the code base of the project. I used this while working on a data-heavy Flash project aided by PureMVC. Sweet indeed.
The Morphic Group » Blog Archive » Using FlexBuilder 3 to debug & edit Flash CS3 projects
Recently I was working on a project that due to a requirement had to be compiled in Flash CS3. Having spent the last few years exclusively using FlexBuilder I was shocked at the HORRIBLE AS3 editor and debugger in Flash CS3. I quickly tried to figure out how to edit and debug from FlexBuilder 3. I got some help along the way, and wanted to share the process.