Earflap Cap in the pattern "Elf Caps" by Michelle Heyman, published in the book Handknit Holidays, and downloadable free from publisher.
The peak also bends toward the back of the head, like in the movie. The yarn is 1 skein of the huge Cascade Magnum as the main color, with another color as ties. Size 15 needles, 2 sts/1". There's also a variation called Pointy-Top Cap which is really pixie-like. Lots of sizes: pointy top (to fit 6-18 mos., 2-4 yrs, 4 yrs- adult sm, adult med-lg), earflap cap (to fit 2-4 yrs, 4 yrs-adult sm, adult med-lg).
Earflap Hat is free pattern at Lionbrand.com in a bulky yarn, 9sts/4".
Earflap Hats has same smaller gauge at 4.5sts/2" and is a free pattern at KnitScene website.cyntergomes
Edit 12/16/2007: Hat kit
Lorilee has a lovely hat kit, including yarn and pattern for $22.