Downloaded it and ran it in a VM…well, until VirtualBox crashed… :
Before you get started, you should know that Chrome OS (or in this early development stage, Chromium OS) is an operating system that essentially consists ONLY of a browser. You can't install applications or twiddle with settings—Chromium OS feels like it's just Google Chrome with no layer between it and your computer. It's a neat idea, but kind of disappointing for software geeks who like lots of settings. It acts just like a regular old browser with not too many innovations, except that it's lightning fast. For more on Chrome OS's backstory, see our first glimpse at Google Chrome OS.
Yep, literally the browser…(but because I am lazy I didn’t read this until now and just rushed through so I was a bit confused at first ;D)
Also, you will need a google account…and an internet connection.