30Aug/090
Learn to Throw a Knife
Wired's How-To Wiki states that the key to a good throw, aside from selecting a well-balanced knife, is the grip
From 12 feet, you'll throw a full-spin rotation. Grab the knife by the handle, as you would a hammer, but keep your thumb along the top edge for stability and to prevent over-rotation.
How-To: Throw a Knife [Wired]