Buy Adam's hair! 'American Idol' merch sales may predict this year's winner

The season finale won't take place until next Wednesday night, but American Idol already has a clear winner: the cottage industries that have sprung up around the contestants.

A glitch in Apple's iTunes software in April temporarily dropped the cloak that usually veils the sales results of the American Idol songs, revealing just how well each contestant was selling. Adam Lambert was atop the list of most-purchased songs, claiming six of the top 10 spots; Kris Allen, with three, came in second. Actual figures aren't released, but considering songs fetch 99 cents each, and some 25 million viewers watch the the show each week, revenue is likely very high.