First off, thanks for creating this. Anyone who's willing to dedicate their free time to teaching others is cool in my book. I think it's a lot harder to teach something than it is to learn it. Below are my general thoughts on this tutorial. I want to stress that I may be wrong on some things, and some things are purely my opinion.
On the trace section, it's my personal opinion that every time someone codes on the timeline, rather than in a class, God smites a kitten. Though I can understand that it's much easier for a quick example of the trace function to use the timeline rather than a class.
In the variables section, not all variable types have to be classified. 'int' and 'uint' come to mind as two that don't need it.
In math, I would consider adding something about the modulo.
On Movieclips, it looks like you may have forgotten the semi-colon on the scale example. I understand that they aren't required in AS, but I prefer to use them because it makes the code more readable.
On functions, you don't specify the return value of the funtion or the privateness/publicness. I guess it's not required. I personally prefer to write my functions like public function myFunction():void {. Again, I guess it's not required. I just prefer it that way because it makes it much easier to read.
On keyboard, It looks like you use flash.ui.Keyboard. I'd suggest possibly explaining imports somewhere in your tutorial.
On mouse movement, it looks like the clicked function got cut off so that it doesn't show 'gotoy = mouseY;'. There are ways to make the circle move to the mouse position without getting to the correct x position before it's gotten to the correct y, or vice-versa. But that'd be out of the scope of the tutorial. I'd personally replace the if statements with else if's or better, a switch statement. But that'd also require adding another section for case statements.
On the wandering movieclip, I can't really read the text due to it's small size. Maybe you could bump up the size of the text and lay it out in two columns.
On game examples, I'd put a note that it opens a link in a new window. I'm a bit surprised that your site is a flash portal. I'd personally rather see a portfolio of your work, or at least a way to filter the list of games.
On video tutorials, I'd put a note that it opens in a new window. I'd also put your tutorials in a playlist and have the link go to that playlist. That way people can quickly and easily see all the tutorials at once.
All in all, I think given the constraints you mentioned, like one frame per topic, you did a great job. I think this, while not a definitive source of info, will certaintly wet some peoples' appetite for learning AS3. I'd like to see the code be a little bit more OOP. Either way, it's still cool as hell that you spent your free time teaching others.