Very nice tutorial
I expected to see another lame tutorial like the ones posted here from people that have just basic knowledge of Flash and AS and think they are sooo great, but actually it was a nice surprise. The overall design was very smooth and good-looking. I thought the music had a bad quality, maybe you compressed it to lower the size, but thats not necessary. Just find a shorter music piece and make sure its good quality. If the tutorial turns out great, nobody will complain if its 5 megs or more. Okay, what else.. great interactivity, nice thing to do was to include the result of the programming in the movie itself.
Overall, I give you an 8. Just a bit work on the graphics - more elements or a bit more color (maybe variations of black and grey) and some improvements to the music will bring you a 10, I'm sure. Keep up the gewd work :)