I just finished putting the finishing touches on phase one of our video and animation heavy Flash / Grails / Flex site. We spent about 2 months on this site, figuring out how to get Flex, Flash and Grails to work together nicely, and I thought I would share some of the lessons learned in this post.
Flex 3 introduces the BrowserManager object, which allows for deep linking URLs with SWF files. However, this functionality breaks when embedding flash files with the SWFobject library. This post presents a very simple solution to get it working again.