Asus Eee PC 4G (white, Windows XP)
Product Summary
The good: Small, light weight, and inexpensive; Windows XP for the same price as the Linux version.
The *same price*? Are they bonkers?
Fortunately, Asus is not the only player in this sector - there's probably around a dozen now. So if Asus won't do the decent/sensible thing and pass on the savings arising from using free software, I'm sure someone else will.
Update: But here it says same price, but more memory for GNU/Linux....