According to a December letter sent to the Securities and Exchange Commission, which became public on Tuesday, Google hopes to put ads “on refrigerators, car dashboards, thermostats, glasses, and watches, to name just a few possibilities.”
more here http://bits.blogs.nytimes.com/2014/05/21/google-plans-to-deliver-ads-through-your-thermostat-and-car/?_php=true&_type=blogs&_php=true&_type=blogs&partner=rss&emc=rss&smid=tw-nytimes&_r=1&