Where do you want Google Cast implemented?
So Chromecast is pretty sweet. It is even sweeter that Google has released a SDK for the platform called Google Cast. What other apps would benefit from this.
1. Google TV - The next Google TV update should have Google Cast built in. To allow Google TV to act as a receiver.
3. Amazon Video On Demand
I should also mention that it would be nice if the also made the Chromecast Dongle Miracast compatible to allow for mirroring on your device.