Flash Frameworks are a big thing nowadays. They make the job of creating a Flash-based web site easier, help you organize your code and files. There are many of these in development out there, but Gaia Flash Framework is one that stands out in the crowd.
Apart from it’s intuitive work-flow and beying open-source, what makes it so great is that it integrates into Flash CS3/CS4, providing an user interface that makes the creation of web sites as easy as pushing a few buttons.
Other features like deep-site-linking, timeline or actionscript based transitions, actionscript 2 and 3 support and scafolding complete the package.
Check out the demo video at http://www.gaiaflashframework.com/.