Something else interesting I've found out in playing with this thing. Although Google Play Music supports Chromecast, it will only allow you to play music you've purchased from the Play Store (and therefore is available in the cloud). Even though Google Play Music will show all the music on your device and allow you to play any of it, you can only cast music that you've purchased from Google.
That's disappointing, but it makes sense since this is a cloud-content only device, with the exception of tabcasting.
Also, you can change the configured WiFi network through the Chromecast app on your mobile devices.
