If you still consider a 12-inch notebook-size netbook portable, then you will find this one interesting. Samsung NC20, powered by VIA Nano processor is now available at newegg at $549.
It comes with Windows XP home edition, 1GB RAM and 160 GB HDD. The VIA Nano processor is clocked to run at 1.3GHz. It runs at notebook-ish resolution (1280 x 800) and comes with a 6-cell li-ion battery.