Interesting articles on the size of the Internet of Things global market
http://www.gartner.com/newsroom/id/2636073
http://www.gartner.com/newsroom/id/2905717
http://www.gartner.com/newsroom/id/2895917
http://www.businesswire.com/news/home/20131003005687/en/Internet-Poised-Change-IDC#.VLM9qKacOLY