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Here are some video experiments for a few friends and friends of friends.

Backflip (2.6MB QT):  Handheld shot of a backflip off of a treestump.
This was done very quick as a proof of concept, trails with handheld footage.
Stabilized, strobed, and un-stabalized to get a trails effect.  Done with DFX+



FIrewire(6.7MB QT ):  locked off shot of a firewire trick that involves spinning
 flaming steel wool, added a trails effect.  Done with DFX+

Here are some stills of this technique, click to see a larger picture: