MIT’s Senseable City Lab has [analyzed] mobile-phone calling patterns across the country. By looking at calls between cellphones, they’ve revealed states and cities that are closely connected — and similarly, regions which aren’t nearly as closely connected as you’d think. Here’s their main result, color-coded by regional affiliation.
Mapnificent shows you maps by travel time, not distance:
Place the pin on the map, and see where you can get in a specified amount of time via public transportation or bicycle. You can also search for locations near you, such as coffee or restaurants. It’s built on top of Google Maps, and it works similarly, but the difference is that locations within your time range are highlighted.