Netflix Switch – dim lights, turn on the TV, order food, and silence your phone
Others have mentioned the Flic and Amazon's Dash buttons. Here's the one I'm most excited about, which should (when they have an IFTTT channel) make things like the Netflix Switch doable for non-nerds: <a href="http://www.dropletlife.com/" rel="nofollow">http://www.dropletlife.com/</a>