I have been playing with Netbooks for over a year right now. The Eee PC with Linux is okay, but they still cost too much in performance to make up for size. And the size actually can be a problem when it means small screen and small keyboard.
I actually would go for a blackberry over a Netbook. And to be honset, Netbook with Windows is a bad idea. Wrong OS. As for Google OS, yah right we will see.