You input your location and your friend's location and it shows you where to meet up at. It is also cool because it seems to do it based on time of travel instead of distance, so if you live in the city and your buddy lives in the boonies, it will take you to an equal spot.
This would be fun for local get togethers or if you are meeting a riding buddy from a different state.
http://a.placebetween.us/