Pizza Compass does exactly what the app's name implies: points pizza-craving users in the direction of the nearest pizzerias, with ratings, restaurant hours, and reviews all provided by Foursquare. If a new pizza spot wins your approval, you can even share your recommendation with friends from the app (or just to gloat you enjoyed a delicious meal).
Not sure if its worth 99 cents, but I could see my pizza-fanatic friends in New York and San Francisco downloading this (they're serious about their pies!).
(Images: Pizza Compass)