Re: I only regret that I have but one...
I do not see how different it is from the Apple TV.
The one thing seemingly different is that Chromecast handles URLs directly (or answers to commands, as stated in the article).
I believe this is the standard way the Apple TV does it.
For local files (from your computer, iPhone or iPad), since the URL is local, generated with the Bonjour protocol, it seems as if the device its pushing to the Apple TV. I believe it is actually the opposite.
For files on the internet, the Apple TV accesses the URLs directly without going through the other device.
You can see this with the excellent Clicktoflash Safari extension (which, among many other things gives you popup menus to push YouTube or other internet videos to the AppleTV) or with the unsupported Airflick app, which allows you to send a URL to the Apple TV.
And, one other thing, it is possible to "send" content from an iPhone or iPad to an AppleTV and do something else on the iPad.
So, I think Chromecast has its chance, and that its price is a very important part of it, but I cannot see what it can do that I cannot do with my iPad and Apple TV.
Apart from that, I quite agree with the arguments in the article, and I really love my iPad (as well as Safari) with Apple TV as a Smart TV interface. (but I prefer to use the Apple Remote for a lot of things, like movie rentals and TV shows)
And I believe that for this part the Chromecast experience can be excellent too.
However, the article title should be "Apple TV (and now Chromecast) Why it's the most important smart TV tech ever"