How should swordfish be prepared?
I love swordfish grilled with a little olive oil and Montreal steak spice.  All the firm fish are great on the grill.

Firm fish like ahi tuna and swordfish can pretty much be treated like really good steak, just cook them carefully because you want them left on the very-rare side of things.

If you do it in a pan make sure there's hot oil or butter (or both) before you add the fish and don't move it around too much.  If you fuss too much with the fish it will fall apart.

As delicious as swordfish is a lot of the fish on the market isn't being sustainably caught.  Make sure to ask where its coming from.  Most of the US and Canada fisheries are pretty good.