first get as much of your weight over the front of the bike as possibly, hump the tank and put your head down low, elbows out... some people like to leave with both feet off the pegs, some like to leave with their shifter foot already on the peg... bring your revs to around 6k and hold it steady, let your clutch out to the point where it will roll forward if you let it out anymore, when the light goes green the trick is for your clutch and throttle hands to be connected, as you let more clutch out you dial in more throttle, if the front end starts to lift use the clutch to control it and stay on the throttle until you can fully disengage the clutch and go 100% throttle... you don't have to slip the clutch on a 600 nearly as much as a 1000, but if your against a guy on equal machinery your ability to do so will make the race

so the the big things
*weight forward, over top of the front wheel as possible
*relax
*smooth clutch slipping

ideally a perfect launch you would have the front wheel just barely skimming the ground