@Charles:There is an awfully large number of consumers who simply don't need and/or want a general purpose OS and for whom such a product will be a perfect fit.
I'm sure we all know plenty of people who have bought laptops (and then netbooks) only to use web-browsing and hotmail, simply because there was no practical alternative.
Apple has already shown there is a market there, and once again MS seem to be missing the boat.
I'm not saying it's not got a use case... Obviously, it does. Windows is a well entrenched, well established, powerful, efficient, performant, capable OS that can run on more pieces of hardware than any other OS in the world (and it does...). IE9 + Windows = best of both worlds -> web browsing runtime that takes advantage of the underlying OS and an underlying OS that supports n number of applications and application platforms. I'll be clearer in what I mean: ChromeOS, even if wildly successful, will not significantly impact Windows in the global marketplace. That's my hypothesis, anyway. Let's not forget that Windows hasn't stopped evolving at Windows 7...