I only skimmed over the tutorial, but it looks good so far. My only suggestion is that you think about your audience. This is posted in the games and graphics section of a forum. How about you take what you've got so far and then add to it to describe how this knowledge can be applied to games programming? Perhaps motion at an angle (actually scratch that there's a tut already on that). Maybe something to do with objects rebounding from surfaces at certain angles?

metal