This video basicallys sums it up.
http://dontbescaredracing.com/video/...77_137_zx6.wmv
Basically hold the revs at about 7000rpm. Look at his hand position, hold it like that so you can roll the throttle all the way easily. Pull the clutch in to the point where its just at the edge of catching. Rip the throttle open, ease/feather the clutch out as fast as possible, without flipping the bike over. Keep your weight over the tank for the 1st couple gears.
Obviously its hard as fuk to do, but its awesome when you get it.