This video of Larry Nevel shooting a jump shot which is 1mm between the cue ball and the jumped ball either defies the laws of physics or is an illegal shot IMO. I think the cue ball jumps up and then is propelled forward by the cue stick. Wouldn't this be a double hit?
http://www.youtube.com/watch?v=S8rvRHZ1sZo
http://www.youtube.com/watch?v=S8rvRHZ1sZo