HopStop is the only public transit app you'll ever need. Get detailed subway, bus, taxi, walking & biking directions along with official transit maps, a nearby station finder, and schedules in 100's of cities throughout the US, Canada & Europe.
This is awesome - Jesse Eisemann, who illustrates and writes for CollegeHumor and Dorkly.com, created an interactive map of New York City based on the style of Super Mario Land!
My favorite bits are the ghosts floating over old landmark places that are either graveyards or presumably haunted by their former occupants. Also, the mario bridge representation of a real bridge is pretty cool.