I've been playing around with Flash for a short time, since last September, and I have a lot to learn. One of the ways to learn is to look at what other people are doing. I thought I would bring forward one particular example that I found interesting to examine.
Check out the Excess All Areas flash object hosted by the BBC.
The target audience is likely young teenagers and therefore, I found this object made very effective use of integrated video and sound. The mouse rollovers were nice and the action escalated as I progressed through the object, and that naturally pulled me through the navigation of all parts of the object. This is excellent.
I also liked the splash screen which gave good explanations of the icons and the functions available to the user throughout the navigation.
One tiny thing that was missing was a universally accessible Quit button.