Apparently, humans are the most popular race in WoW. Doesn't seem quite right to me; I'd've bet on night elves before Burning Crusade, and blood elves afterwards.
I swear, however, that when I rolled my first-ever WoW character, I didn't know night elf hunter was the most popular race/class combo; I was just having an archer jones at the time, all my friends had an Alliance guild, and I thought night elves were prettier than dwarves. I have since made a female dwarf character, but the night elf hunter remains my only 70--aided by the fact that I haven't even logged in to WoW in at least three weeks.