I love the son's Asus Eeepc, it's very portable, secure, and you can use the wifi anywhere. Now, the major laptop vendors are starting to put an eeepc-like chip in every laptop. This allows a rapid boot, and instant access to wifi. This will be the way Linux sneaks into the corporation, since you'd have to be a fool to use MS in an airport. A recent survey showed that most laptops in an airport had some sort of wifi malware.
The real problem in shrinking down these machines is the keyboard and screen, even though the whole computer is on a chip. All this action is going to be very interesting!