"The promise of Chrome and Chrome OS is that the devices that you give to your employees will have a 2-second boot time, will be completely disposable and the price will be incredibly low."
Chrome OS computers will no longer be personal because it doesn't matter which computer you use. After logging to your Google account, Chrome OS will retrieve your bookmarks, themes, settings, web history from Google's servers. Your data is stored in a central location and you can access it from all your devices.
Computers will boot almost instantly, so you no longer have to wait. They'll be cheap, easy to replace and to maintain.
You can already use Chrome on your computer, but a Chrome OS computer is optimized for running a browser, doesn't have extraneous software and it's inherently more secure.