Recently, I noticed a new option in my Chrome Canary menu on my desktop running Windows 7: Relaunch in Chrome OS Mode. Clicking it does exactly what you would expect. It shuts down your current version of Chrome and relaunches but as if you are using the Chrome Operating System. This is still listed as experimental and is not yet in Chrome Beta let alone Chrome stable.
So, why would anyone be interested in this feature? Well, if you have a Chromebook, you could get your Chromebook experience and sync while at work or using Windows 7.
Additionally, if you're interested in getting a Chromebook but not sure about using Chrome OS, this gives you a chance to test drive it for a while before making up your mind. If you were looking to set up a decent solo office on the cheap, this could be a possibility.