Here are some videos you might like to see.  The first one is a really old "impalement" act of knife throwing.  The rest are of friend of mine from the knife throwing world.

Knife Throwing Mother of the 1950’s
International Knife Throwers Hall Of Fame
Renaissance Fair 2006
Wild West Arts Club

Another thrown in just for fun, and NOT part of Sa Bum Nim’s list of video’s is:
Guys training before exhibition throwing knifes in the mexican independence day parade in Santa Ana, California

A research physicist has produced an interesting and informative video on the atlatl.

Videos