Netbook makers, are you listening....
This is the spec that will sell.
A minimum of 1024x768 screen, 10.1". (Hopefully 1366x768). No bigger than 11" or might as well buy a full blown laptop.
A GPU that will allow hardware acceleration for 1080p playback, ION good enough.
HDMI and VGA outputs.
Dual core atom, or ARM for Linux fans. In the case of Linux it MUST play higher quality flash video without stuttering. (Flash on windows can use GPU acceleration, this is NOT coming to Linux, DIE FLASH DIE!)
3 USB ports is plenty, and if USB3.0 is so much more expensive than 2.0, then 2.0 is fine.
Bluetooth, again 3.0 is not needed unless it is not much more expensive than 2.x
SD card slot
Wireless N (G if it keeps cost down, but since my EEPC901 has N then it can not be much more)
Gigabit Ethernet. (100Mb OK if much cheaper)
How hard can it be?