Pizza Park on Ave. U in Brooklyn. Easily the best in all NYC.
You do remember that Google can help you too? :)
http://www.gayot.com/restaurants/best-newyork-ny-top10-pizza_1ny.html
http://gonyc.about.com/od/restaurants/tp/best_pizza.htm
http://nymag.com/restaurants/cheapeats/2009/57893/