Well, the only sure way to get it is to get a camera with a nice rate-of-fire... I fortunately own a 1D, which does aroudn 8 frames per second. With that, I score around 70% of the time.
Unfortunately for the owners of cameras with 3 or less fps, it's a guessing game. Practice makes perfect though, so you might want to rehearse before to see what's your 'shutter lag'. I got pretty good at it, when I was practicing this with passign cars (on the shoulder of a hightway). I was trying to time a car passing on the center of the frame.
Took a few hours to get it somewhere around it.
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