I love to barbecue in the summer. When I barbecue anything I like to add a bit of spice or marinade and my favorite are "rubs".
Here are two that I have tried and enjoyed:
For steaks:
http://www.epicurious.com/recipes/food/views/Grilled-Rib-Eye-Steaks-with-Mediterranean-Rub-4062
For chicken:
http://www.epicurious.com/recipes/food/views/Grilled-Chicken-Moroccan-Style-108244
Enjoy.