So far, Glass Nickel has the best pizza that I've tried in Madison. They're quick to deliver, easy online ordering, and they notify you via email when your order is out for delivery!
Their menu includes some interesting specialty pizzas. I've tried the Sacre Bleu, which includes canadian bacon, salami, and blue cheese (YUMMO!). I've recently been privy to the Fetalicious. They have a lot of other cool combos that look intriguing.
4 stars because Glass Nickel isn't the most amazing pizza I've ever eaten in my entire life, but it's a great go-to pizza delivery joint!