Popping the clutch is not that important of a term. Like Kurt said, you don't want to have wheelspin. That does you no good. There is a way to launch every car that makes it feel like it "jumps" off the line. There is no set way to do that but if you can figure it out you will have great times.
Launching is all about clutch play. Let it out quickly but be careful. The best thing to do is go to a parking lot and figure it out.
And that powershifting stuff, I wouldn't recommend it. I have never done it so I don't know if it is faster or not but it will screw up your tranny. You are best just learning how to shift quicky and SMOOTHLY from gear to gear.