Flash MX launched today. Check out this visual walkthrough:
Note the developers > component section where they show a full compliment of user-interface elements.
This is a very credible threat to Mac OS X as the primary audience for this is graphic designers and scripters. It will be interesting to see how Apple responds. Remember, as an organization, Apple doesn't understand the web as deeply as Macromedia does.
(Had I gotten the WebObjects product management job in late 2000, I would have made acquiring the Report Mill technology/team a priority.)