Everyone else is right about heating the stone up. I do pizzas in the kettle especially my 22.5 otg. This pic is from my SJP but its exactly what I do in the big kettle as well. It works really well for me I just set it up on 2 fireplace bricks and preheat for 10 mins then put the pizza on. I've been getting great crispy results. Hope this helps I'm sure others have good ways to do it also.
22.5 OTG, 18.5 SJP (modded), 14.5 SJS, Weber Q 100, TX Longhorn Camper grill TL 21
[URL="http://www.bbq-brethren.com/forum/group.php?groupid=39"]ZERO[/URL] Club Member (2)
"The Great Chicken Sammich Debacle of 2010"