This is something I recently decided I had to finally try. I saw it on an episode of Good Eats, and decided it was really a great idea, especially since its 85 degrees in my house right now. Throughout the years I've actually found a surprising amount of Alton Browns recipes to be really good so I tried out his recipe with a few differences. I made more of an "American style" pizza with a sourdough crust lots of sauce and spicy sausage. It really was pretty incredible. Although I've made it a few times since I'm still mastering the art of...not setting my dough on fire. One night I even made these little pizza buns on the grill as well.
External Link to blog post and recipe: http://neo-homesteading.blogspot.com/2010/07/grilled-pizza.html