Screen Mirroring with the Google Cast Extension

Want a cheap alternative for mirroring your Mac or PC screen to a TV or projector?  All it takes is a $35 Chromecast and Google Chrome with the Google Cast extension added.  While still in the "experimental" phase, my weekend's testing from both Windows 7 and OSX Yosemite was flawless. Click on the tiny down arrow as shown below to reveal the "Cast screen/window" option.  Easy peasy.

https://chrome.google.com/webstore/detail/google-cast/boadgeojelhgndaghljhdicfkmllpafd