HP has the HP Mini Mi Intel Atom N270 8.9″ Miniature Notebook Computer for a low $279.99 Free Shipping. Tax in most.

2.25lbs; Intel Atom N270 @ 1.6GHz; 512MB RAM; 8GB SSD; 802.11b/g; Linux; webcam; 3-cell battery; 1yr warranty

Of note, this uses a custom version of Linux by HP which does away with the command line and provides a more user friendly visual front-end for those new to the operating system. It is designed for quick and easy access to the most commonly used applications on a netbook.