Deviant Art's billybob884 created this masterful, incredibly detailed papercraft model of Halo's Master Chief, and included the source-files necessary to make your own.
The final model comes out to be 13" (33 cm) tall, has roughly 2100 faces (+ ~800 for the gun), and is made up of 42 pieces (+ 10 for the gun). To build yourself one of these (hope I'm not sounding too full of myself,) kick-ass models, you'll need:
> a copy of the instructions I wrote,
> the PDF of the pieces,
> and the PePaKuRa model file, because this one is quite tricky.
(Thanks, Scott!)