The latest update for the Chromecast has brought with it a “guest mode” that you can enable by going into the Chromecast app on your device and simply flipping the “Guest Mode” switch to on. Now anyone (with an Android device running at least 4.3) within range of your Chromecast will be able to share to it without the need for your precious and zealously-guarded Wi-Fi password.
I can see this as a great feature to turn on at a party if you want to let people keep tossing up their favorite videos or music without having to let them use your device or providing them all with your password. Just remember to turn it off again when the event is over, lest you fall victim to some pranksters doing a hostile takeover of your TV.
And if you don’t have a Chromecast, remember that if you buy one before December 21st you will get $20 in Google Play credit.