The amount of attention by self proclaimed experts on Chrome OS is rather unnerving. For those who do not know, Chrome OS is a Linux distribution filled with adware, basically a trojan horse for Google's advertising business - minus the bits that makes Linux great. You may realise that I have adsense on this blog, but you can always adblock it if you want to. With a Google controlled OS and browser, you may not even have a choice.
If you want an open source operating system, stick with OpenSolaris or many of the billion Linux distributions out there. Also harddrives are cheap as chips, so I see absolutely zero reason to trust your data to the "cloud". Anybody who is excited by this and "cloud computing" ought to open up their eyes and realise they are basically putting their data into the hands of a corporation, whose interest lies with their shareholders and no one else.