The lack of vision in this thread is astounding but perhaps understandable. These machines are not targeted at iPad owners or even Mac owners generally. They are targeted at students and enterprise.
These machines have day-long battery life, require no antivirus software, require no software updates or patches whatsoever, store all of your files in the cloud, and come with a three-year full replacement and support plan. All for $20/mo. as a student or $28/mo. as an enterprise user. To put that in perspective, the student user would spend $960 for four years of college, and get two laptops out of it.
This is potentially a Windows killer (eventually). Anything that the Chrome OS can't run right now, you can run virtually via Citrix on a remote Windows machine. Large corporations could gut IT departments if they switched to these machines. And small corporations can scale up faster by essentially outsourcing their IT problems to Google.
I don't understand the comments about Internet access either. Where you do use a laptop that doesn't have wireless? On college campuses, wifi is ubiquitous. In cases where it's not, you can get the 3G version. I can't remember the last time I turned on my MacBook and didn't have a live Internet connection. But Google announced offline access to Gmail, Docs, and Calendar coming in the next Chrome OS update anyway, which some of you seem to have ignored.
If you are not a student interested in a MacBook, a heavy PC gamer, or going to major in something heavy on Windows-based software, then I foresee no reason laying out $1000 on a Windows machine that will be obsolete by the time you graduate college. You can lease one of these devices without increasing your loan burden.