The pizza button is a fantastic idea as an iPhone app. Show a huge pizza icon, nothing else, press it and get your pizza delivered to your home and discounted from your credit card.

As a developer, here are the interesting bits:

  - Press many times get as many pizzas
  - Configurable default pizza
  - Configurable default credit card
  - Configurable address
  - Keep it as simple as possible

Press pizza, send order to papa johns, get back confirmation and estimated delivery time.

Love it!