FourSquare currently does this - they've been partnering with restaurants for some time: http://foursquare.com/businesses/ http://foursquare.com/businesses/ (l

FourSquare currently does this - they've been partnering with restaurants for some time: http://foursquare.com/businesses/ http://foursquare.com/businesses/ (large list of businesses and some info on the program) If you check in near a special, it'll tell you - also, if you check in near where your friend has left a 'tip', it will tell you as well. I don't know if Gowalla has any similar functionality.