3D glasses: As lucrative as they are dorky. No less than four companies are fighting for the privilege to make it seem like things are popping out of the screen at you during your favorite 3D films.

If 'Avatar' makes as much money as 20th Century Fox basically needs it to, we may never see a plain 2D movie again. Variety reports that 3D films tripled their B.O. take this year, to $1.3 billion.