I bough the bare bones kit from NewEgg a while ago (
http://www.newegg.com/Product/Product.aspx?Item=N82E16856119016) but never did end up using it. My play was to us it as a media player, but I've been swamped with other stuff. I just took it out of the package to install a 2GB RAM stick and 80GB hard drive. All in all you are getting a great deal. The computer has enough power to play 1080p HD video (something most nettops don't). Other than not being able to play modern 3D games, this will do everything else (and takes up a lot less space and a lot less power). If you are curious as to the exact specs, take a look at the newegg.com product description I linked to above: but in general:
Intel Atom 330 1.6GHz dual-core processor
2GB RAM (supports up to 4GB)
80GB WD Hard Drive
NVIDIA ION North Bridge
NVIDIA ION graphics processor = 1080p Video
8 Channel (over HDMI or Optical)
10/100/1000Mbps
Wireless 802.11b/g
SD Card Slot
6 USB Ports
HDMI/DVI/VGA Connections
65W Power Adapter
Also has stand and mount to connect this to the back of a monitor.
No Operating system, but I'll install XP (with your key), Windows 7 (I can deliver it to you so you just type in your key when you get it), XBMC, or pretty much any flavor of linux.
Asking $250 + shipping (probably $10)