Lately I've seen a lot of recipes that call for grill seasoning. Besides the cost (nearly $5 for a bottle), it's chock full of MSG and other nasties. Taking a tip from Rachael Ray, I've made my own and use it for anything I'm grilling or want to give a grilled taste to.
UPDATE: Monstr pointed out there's no MSG in McCormick's grill seasoning. There is, however, hydrogenated oil in it, and MSG can be found in other brands. So read your labels, and if MSG, hydrogenaged oils or the price tag bother you, mixing your own is the way to go.