Good beginner page, AJC. Only thing I get bent on is the old propaganda that too many of us have fallen for, and that is complex vs simple carbs.
You state that complex carbs are slower "burning" or "released", and you cite several examples. Unfortunately, potatoes, rice and pasta are not "viewed" any differently by the body than sucrose or glucose. Studies have shown that high starch carbs, that are devoid of fibers (or unusual polymeric structures), are digested and absorbed by the GI at nearly the same rate as glucose or sucrose.
Complexity of chemical structure is more of a technical matter, and does not always pan out into physiological relevance. The true test of a carb should always be the fiber content. This is essentially the true determinant for absorption rate and effect on insulin levels.
Also, fruits often times have low GI's depending on their sugar profile. Grapes and its juice should have a high GI due to its glucose content, while apples will be low due to higher fructose.
The page is very good, I just hate the idea of a fat kid thinking that rice and pasta are good carb choices for him to diet on. I know, I was that fat kid.