Let's say you're meeting a few friends or colleagues for lunch during the week, and you all work in different parts of town. Common etiquette is to find a central meeting location for everyone, and MidwayMeetup makes it easy to do this.
From the site, you enter everyone's location, then enter what you want to do (coffee, lunch, drinks, etc.), and the tool maps out a number of spots equidistant to everyone. The site also marks the central location with a green arrow that you can drag and drop to your liking.
The site is currently in beta, so the locations are limited, but it still works well. Give it a try for yourself at the link below.