Google is slowly trying to change the way we access the web and use online service by replacing the more typical operating systems we mainly rely on today with Chrome OS. The only official way to start using Chrome OS at the moment is to purchase a Chromebook, but they are a few hundred dollars.
Instead, you could download the open source project and attempt to build it yourself, but there is an easier way. Liam McLoughlin, otherwise known as Hexxeh, a hacker who has already had Chrome OS running on an iPad, and ported Android to Google’s Cr-48, maintains a version of Chromium OS that you can run directly from a USB stick.
The latest version of his version of the OS is called Lime, and it can be run from a Windows PC, Mac, or Linux machine. All you need do is download the image, load it on to a USB stick, and boot your machine from that stick.