@jedixman: I haven't seen it in a while, but didn't Thor lift the Destroyer into a whirlwind and then just smash it with Mjolnir (or did something in that whirlwind).
It was actually just on TV.
He did lift the Destroyer. But he destroyed it when the Destroyer fired a continuous beam; Thor simply blocked it with Mjolnir and essentially pushed the beam into the Destroyer's face. He didn't actually hit the destroyer. He used its own power against it. When he got close enough, he put the hammer close enough to the point where the beam caused the Destroyer's head to explode, and then the entire thing was destroyed in the whirlwind.