An excerpt from Walt Mossberg’s net-negative Cr-48 review
The Chrome OS will have a big advantage. Because it is mainly a front-end-to-cloud service, if you lose your laptop, you can get another one and just sign into your cloud accounts. You should be able to find all your stuff waiting for you.
However, users of the Chrome OS will have a huge adjustment to make. They will have to give up the rich, local programs they have spent years learning to use and tweaking to their liking. You can’t install local programs on a Chrome OS computer. Instead, Google provides a Web Store inside the browser that allows you to download icons for “Web apps”—mostly websites designed to look and work like standard programs.