The AT&T Hackathon in January was a blast, and my coverage of it as an M2M coach for the Arduino hardware gained some attention.
Check out the O’Reilly post at http://blog.makezine.com/2013/01/30/results-from-arduino-hackathon-at-atts-2013-developer-summit and the original at http://developer.axeda.com/community/blog/9-connected-hacks-rocked-mobile-app-space-2013