If you’d like to see Grant Skinner build an AS3 version of his gModeler UML tool drop a comment on this post:
http://www.flashcoder.net/blog/?p=159
If you use Flex Builder help make it better by taking this survey (takes about 15 minutes):
http://blogs.adobe.com/flex/archives/2009/02/help_the_flex_team_by_taking_o.html