You mean the Mac UI is not good for small screen right :)?
If high res 9/10" screens work great although. (Like w/ the dell mini 10)
Yeah the Mac UI is designed for the widescreen format. And I don't believe there has been a widescreen netbook yet, am I right? I think a few months ago someone posted here on HN about a "Hello Kitty" looking netbook that had very impressive screen resolution but even it didn't have widescreen format if I remember correctly.
I couldn't find one that isn't widescreen on Dell's, HP's or Asus' website. Even the old Asus EEE PC 701 (the model that arguably started it all) is widescreen.
The whole netbook format owes its existence solely to the market being utterly flooded with portable DVD player LCDs -- those awful 7" 800x480 screens cost ASUS less than $5 each!