Developing for Google Glass discusses building apps for Google Glass using Xamarin and the Glass Development Kit (GDK). It introduces the different states Glass can be in (active, inactive, off) and demonstrates how to build a sample Foursquare app and a public transit app for Glass in C#. Reasons given for developing for Glass include that it allows for new types of apps due to its wearable form factor, can be used for advertising in novel ways, and Glass is currently a popular technology topic.