I love Ian's pizza. I love that they're open until 2:30am on the weekdays and 3am on the weekends.
Ian's has been my favorite late night post bar food for years. They have tons of specialty slices with interesting topping combinations like philly cheesesteak or eggplant parmesan or taco. The mac n' cheese pizza is my favorite along with the pepperoni. Even though their specialty slices are interesting, the best thing about Ian's pizza is not the toppings - it's the crust. Their crust is definitely the best crust of any pizza place I've ever had in Madison. It's thin crust, but it's not a soggy crust that doesn't bear up to the weight of the toppings nor is it a crispy cracker crust. It's a crust that's been kneaded and risen just enough that it has a chew and all the delicious yeasty-ness of what good bread should be.