I have only *watched* pizza being cooked on a proper stone - but my friend does amazingly well with his peel and he claims the trick is cornmeal on the peel,then put your pizza dough on the peel, make the pizza and then slide it onto the stone. I've watched him do it, and it really does seem to just slide right off.

The trick is that when you take the pizza out of the oven, you must wipe off the cornmeal left on the stone - else your kitchen will apparently fill with smoke :)