Nathan Yau gets googly-eyed over Mapnificient:
A lot of time when making plans to meetup with friends or family, you're not so concerned with how far possible locations are than you are how long it takes to get there. Similarly, when deciding where to live relative to your workplace, you care more about how long it takes to get to work in the morning than you do how many miles away it is. Mapnificient lets you do this. Place the pin on the map, and see where you can get in a specified amount of time via public transportation or bicycle.
The Dish 