John Mayer
It's a Foursquare API wrapper.
Usage
Get a foursquare:
foursquare = Foursquare::Base.new("ACCESS_TOKEN")
Find a user:
foursquare.users.find("USER_ID")
Find a checkin:
foursquare.checkins.find("CHECKIN_ID")
Find a venue:
foursquare.venues.find("VENUE_ID")