I saw this on another forum and I thought it was pretty neat.

MAKE SURE YOUR GUN IS UNLOADED BEFORE USING ANY OF THESE EXERCISES

http://www.mattburkett.com/flashfiles/dryfire.html

You can pick from all kinds of targets from swinging, moving, or stationary. There is a formula that you can plug in with you screen size so you know how far the target would be IRL.