"* Obviously, you're going to need a wireless network, be willing to use it subject to the provider's terms and conditions, and be ready to put up with its real life limitations including, for example, its speed and availability. When you do not have network access, functionality that depends on it will not be available."

http://www.google.com/chromebook/#features

That's some very important information to put in a footnote at the bottom of the webpage. I'll have to check network availability in my most common locations before deciding whether or not this is useful for me or one of my children.