Just a quick FYI, but I just uploaded a couple of simple ExternalInterface API examples to labs.
The ExternalInterface API allows for player / container communication (such as ActionScript / JavaScript communication).
I plan on uploading some more examples over the next couple of days.
Note, these are built with ActionScript 3 and Flex 2, although the API is available in Flash 8.
You can view the examples here.
You can download the Flex Builder 2 / ActionScript 3 Alphas from here.
