The most interesting thing about ChromeOS (to me) is the way that it updates. My understanding is the ChromeOS has two root partitions and when it updates, it updates the one it is not currently booted from. After updating, it then boots from the newly updated root.

I haven't heard of this technique being used in any other Linux distribution and I think it is quite novel. Sure, it wastes some disk space, but that if fairly cheap these days.