Chromebooks were the only laptop category that stood out at CES as legitimately new. And Dell, Toshiba, and Lenovo are now serious about the category. Read this article by Brooke Crothers on CNET News.
Completely agree +Dennis D. McDonald It's a natural evolution of technology, where most things don't work well in the beginning, but gradually the flaws are ironed out. It's still not 100% perfect (like Google search is not), but as long as the users can do a bit of 'last mile' and be a bit patient, the occasional delight is worth the occasional annoyance.
After reading through a bit more, it works only from the services/ apps where it's enabled - such as Netflix & YouTube today (am sure more apps are coming). The streaming happens from the cloud, not from device to TV. There's a Chrome beta, by which you can stream anything on your web browser to the TV.
As far as I understand, it cannot stream your content (a video stored locally on your computer) to the TV (unlike Samsung AllShare, which streams device to TV using the same Wi-Fi network). A local video will need to be uploaded to the cloud for this to be played through Chromecast on TV and it might still be quite hard to do - but who knows how it'll happen in the future!