<p>I've so far dabbled in Flash doing 1-man shows for quite some time, but have never done any big projects with it, where actually source management and code-reuse was truly necessary. However I'm considering Flash for a new project, but this time around it's won't be a 1-man show, that's when it struck me that I had no experience of how one is supposed to do that with flash.</p>

<p>What are some good tips or resources that could help us figure out a good workflow?</p>

Good communication
Don't work in .fla's. 100% of the code in .as files
UML (at least discussed)
Different tasks for everybody
Comments in commits to code repository
"Manage your code so that anybody can at any time take over your job"
Consider
the bus factor
With junior developers it's also good to go through basic stuff such as package structures etc, just so that everybody is on the same page.
I think it's also good if somebody is kind of like a technical manager of the project, overseeing what the developers are doing. It may also be one of the developers but i think it's important to have one person who knows what everybody else is doing.