Pretty impressive, but I have to say the example missing game logic and there being some rather peculiar collisions (I hit one ball which proceeded to orbit the cue ball as it moved along the table - weird) is a little jarring. Still, it's just meant to show the basic idea behind it, so it can be forgiven.
What I think is the main issue is that this is a 375 line piece of actionscript, and comments are not a good way to describe the thought processes behind something quite that long. I think it could have done with a more "building it up piece by piece" approach, where you might just have two balls and describe how it handles collisions, one ball and how it handles the potting logic. (the other good bit about that approach is that you can then revisit it to introduce things like spin, gradually building up a more and more realistic table)
Anyhoo, nice to see you're still going on the tutorials, hope to see some more.