I have never understood why NASCAR is so popular. I mean, why do so many people go to see which redneck drives arounds in a circle fastest this week? And why is it a sport? I thought sports were supposed to test the human capabilities, push the human body to its limits, be the fastest, strongest, smartest player. Nascar is a test of machine. Anyway, I've never liked any sport that exists only in a circle. Track, horseracing, nascar (and other car/truck racing), not my bag.
As for the question at hand, soccer is the most popular worldwide, had to be - I have no stats for you, but it just seems like it is.
BTW, railspec, do you know what Carlin says about lacrosse - not a sport, but a fagot colege activity.