do you guys realize how much it was driving me nuts that i couldn’t just SHOW you the difference – actually demonstrate the technique in front of you? you guys know how the typical boxer throws a cross. however, in wing chun, the body usage is completely different, and i really wanted to show you the differences – i wanted to provoke a few light bulbs.
oh well. thanks for the compliments. happy i could help. 
and merryprankster: i didn’t mean transferring all the weight to that front foot. just most styles that have similar punch forms as the tkd i learned may start 50-50 or 60-40 or whatever, but there is a fair amount of weight being transferred to that front foot to maximize the power of the strike. once that strike has either missed or increased someone’s dental bill, the weight, like the punch, retracts to its original position, hoping to make the aforementioned attacker uglier again.
and again.
and again.
as far as power generation, boxers are pretty darn keen at recognizing such generation, so yeah. time for more anology:
i drive a car to travel. i understand concepts of internal combustion, power transmission, power distribution and traction really well. i also understand the secondary concepts of direct-current electricty to power the extraneous stuff and to keep my battery nice and charged. all this comes into play for better, more solid driving on my part, and if something is not working right, i can stop and examine a specific part – say, my distributor – and realize that, without proper current being routed to necessary bits, my car won’t drive for poop. i take that one piece, fix it, and i’m golden.
i also fly to travel. however, for this, i’m along for the ride. i understand little about jet propulsion and aerodynamics when applied to air travel (i know 'em well when applied to that ground stuff). all the little bits on planes confound the hell out of me.
the point? simple. i can look at either method and say, they both get me somewhere. one i know how and why, the other i don’t. but i can still recognize the effects.
by the same token, a boxer, who may have no clue why i’m stepping with all the weight my back leg and my feet are flat on the ground and i’m punching with my elbow down with a vertical fist, will be able to recognize that my motion, coupled with a punch, will make someone uglier than even a loving mother could endure.
sorry i’m so long winded. but you provoked me and i had to respond properly. 
merryp: one more thing: protect that left side, else you’ll get your back exposed faster than you can say, “please, not in the bum.” 