And to add a third must to Bill D's suggestions, be sure and let the steak rest for at least 3-5 minutes before cutting into it. It allows the juices to distribute evenly instead of running all over your plate when you cut it!
Yep! An absolute must. I loosely lay a piece of aluminum foil over it and let it rest 10 minutes....if I can wait that long!
Dangit, all this steak talk, I just went to the freezer and grabbed out some ribeyes to barbecue tonight!