I was wondering about the "demographics of nerdiness" as well, as this article didn't seem to take into account regional/ethnic differences (e.g., I think these were all Californian white nerds, no?). Yes, the Asian/American thing is an interesting question...but what came to my mind was Jewishness.
Prof. Frink (sp?) on the Simpsons was revealed as Jewish, and the hyper-nerdy cousin of Kyle (?) on "South Park" is also hyper-Jewish (as opposed to hyper white).
I've always found it ironic that Jews, who were not white at all fifty years ago, are now a kind of hyper-white.