In my role as a PM I see lots of feature requests and suggestions that we should do “X” as part of Flex. Unfortunately we can’t do everything, and in fact don’t necessarily have the expertise in-house to do many of these features. But we do have a great community of passionate folks who sometimes do know about related technologies and are interested in making a difference. Projects like Cairngorm, PureMVC, Mate, FlexLib, FlexUnit, and more recently FlexCover etc were not started by the Flex team, or even Adobe (Cairngorm was done by iteration::two before we bought them).
I’ve gone ahead and created a page on our open source site with some suggested projects that I’d love the community to work on. Things that we’d probably do if we had all the time in the world and infinite resources, but that we probably won’t get to in the Flex 4 time frame. Many of these are based on conversations I’ve had with folks, where they’d even be willing to participate. So if you see a project you’d be willing to lead, please please please speak up!
You can also of course suggest more projects and I can add them to the page. If you know of a project that we should be promoting because it addresses some of these already (or it should just be promoted in general) we can put it on the related projects page.