We have steak every Saturday. If I'm not in an adventurous mood (or am tired), I simply sprinkle it with Lawry's seasoning salt, garlic powder, and fresh pepper, then grill on the George Foreman. Some other easy things to do are to sprinkle some bleu cheese on top as soon as you remove the steak from the heat (this makes the bleu cheese melt a little), sautee onions and/or mushrooms to throw on top, or spread a little dijon mustard on top (though that might be too spicy for your taste).
I have found a lot of great recipes at www.cookinglight.com
(you have to log in to see the recipes, but they are worth it!)