A Better Course

"How nice would it be if, once foursquare gathered enough data on your travels to establish that you’re falling into a routine, it suggested a point of interest based on the path between your two most-travelled check-ins that required you to take a very slight diversion to experience it." — could this be done via noticings? Routing you to see something new as they're added?

Historypin, which launched a few months back, places [the history of the Blitz] in their most recent collection. Old pictures are pinned on top of a Google Maps street view so that you can see the destruction of the past and what the street looks like now.