The video of my talk at //build 2014 is online: "Understanding Customer Patterns: Instrumenting Your App for Telemetry and Analytics." The written version of this is what I published on the App Builder's blog recently:

Thanks to everyone that downloaded my 15+Puzzle app and played with it a bit. I also had a number of folks in the audience do it during the talk, which made a compelling presentation. And yes, I did give away all the prizes I had…about 6 people approached me afterwards showing the app with a medal. 🙂