Here's a good review of Flash MX 2004's support for CSS. Apparently, it is not quite what we hoped it would be. Nonetheless it is a significant new feature and we hope Macromedia will continue to develop this feature to support more attributes.
Note also the reply (comment no. 7) by Macromedia Support which links to an employee's personal blog on Macromedia MX. It's comforting to know their employees are aware of what users think of their products.