If you’re trying to get a fix on how the AS3 projects are set up, you can check out the repositories now at http://browse.puremvc.org/wsvn
The trac wikis are not public yet and what's in the repos isn't supported yet either.
I’m in the process of moving the projects to PureMVC 2.0 and optimizing their structure to make it easiest if you’re loading the project into Flex Builder 3. However I include no IDE specific stuff (.project, .actionScriptProperties, html-template, etc are added to svn:ignore).
Also, releases for every port, demo or utility is are tagged and the wiki will tell you the latest tag.
As I said the projects are being swept through right now, so at the moment the ones not yet in compliance are: Query a CFC, File Upload and AppSkeleton. So overlook these for the moment.
In Flex Builder, assets unfortunately need to be under the src folder (argh!) instead of a sibling to it. A build directory makes sense, and is a coming step, we just don't have the scripts that are ready for public consumption yet.