From Wired:
This, as it turns out, is a new revolution in games: the anti-HUD movement. Recently, several new games have renounced the HUD. In Doom 3, the ammo count for your chain gun is displayed not in a floating bar, but on the headstock of the gun. Peter Jackson’s King Kong doesn’t offer a scrap of onscreen artificial data: Adrien Brody’s voice calls out the ammo count each time you reload, and low health is denoted by shaky, blurry vision.
Here.