Launch control is something you can add to a tunable ECU (Or I think msd makes an add on piece that will do it) that acts almost the same as the rev limiter of your car but much lower so it won't harm the motor.

That way you can just floor the gas pedal and the launch control takes over and won't let it rev past your desired RPM. That way you launch pretty much the same every time.

Ex- If you set your launch control to 4000rpm and you get in your car and the car is not moving (sitting at the starting line) and you get ready to go you just floor the gas. The car will rev to 4000rpm and stop so all you have to worry about is watching the light and letting go of the clutch. As soon as the car starts moving the computer senses it and turns off the launch control and lets you shift at redline or wherever you want.

Hope that helps