http://www.6dsystems.com/public/SparkFunAndGlass.jpg
I can only imagine what I’m going to do with this 
Not pictured are some other sensors, Altitude, Temperature/Humidity, and an Airspeed sensor (not from SF). Glass just arrived today, will be working with Xamarin to develop the application. I really can’t say too much since it will be a commercial product but I will keep you updated on interfacing with Glass and real-world devices.