1. Every time someone shows you a YouTube video, you spend 10% of your time watching it and the other 90% thinking about that one video you know of that's funnier. With Chromecast, you can queue that sucker up for nexties right from your own phone, without interrupting the video that's currently playing.
2. Chromecast does NOT use the resources of the device used to control the TV for processing...its don't on the dongle itself. This will save battery power, minimize bandwidth consumption, and you can do other things with your phone while watching things on the TV.
3. If it can run Chrome, it can cast to Chromecast. Apple, Microsoft, and Google devices playing together in one ecosystem. No more throwing the babies out with the bathwater.
4. $35.00. Thirty-five dollars for a device that ups the WAF most HTPC nerds have dreamed of for years! I would have bought this at $100!
This is what the Nexus Q was meant to be, but hardware drove the price down dramatically.
I haven't been this excited about a new piece of hardware since the iPhone. This is a game changer.