The client, a national non-profit, had partnered with several Foursquare-friendly businesses throughout the holiday shopping season. If you checked in at a location nearby, the business would alert you that a certain purchase would result in a donation to the non-profit. For instance, if you checked into a restaurant, and there was a Starbucks nearby, you might receive a message that buying a grande gingerbread latte would net a $1 donation.
When I told them, they liked the idea – but were a little disturbed that I was dreaming about work. But as other non-profits are finding out, Foursquare can be a useful tool for connecting with supporters.