Mr. introduced me to grilled corn on the cob when we started dating. I have never had boiled corn on the cob since. lol. There is nothing special to do, I buy white corn and keep it in the fridge until grill time. The chill will create moisture to help it cook the corn when grilling (some people soak it).
I use a medium-high heat (gas grill) and keep turning the corn every so often until it's all nice and charred, about 25 minutes. Let it cool slightly, take a damp clean rag and pull off the husks and wipe the silks away. A little butter, salt and pepper and it's SOOO good! The corn is light and crisp. I bought 8 ears of corn for the 5 of us, they were gone! We all love it.