Roundhouse
 
Don't just throw and swing the kick - my arms need to twist the upper body to the opposite direction that the kick is going to generate maximum power.  This kick should feel like a simulation of a catapult (that's the best analogy I can think of).  This is the most important factor for maximizing power with a roundhouse.

Otherwise, just keep in mind:
* Point knee towards target
* Tippy toe with non-kicking leg
* Kick past target, then chamber past target.  Pros do this (i.e. Mirko).  If I don't, damage will be just a tap. 
* Put hand farthest away from opponent in front of my face when twisting my body

 
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