Mary Lou Jeppsen just announced a new USB option for Pixel Qi's 10" screen. Now you no longer have to install the screen in a netbook. You don't even have to have it plugged in to the PC:
Today we announce such a solution, the Display Solutions d-screen-Qi10. Display Solutions AG has developed the d-screen-HYBRID driver board which has been combined with the low power, sunlight readable Pixel Qi 10” screen. This module can be plugged into a laptop (or even some phones) via USB for easy access to a second screen. Even better, you can skip the cables completely and use this second screen via wireless-USB: meaning the data is sent to the screen wirelessly and the screen runs on batteries alone.
If someone offered this as a finished product I'd get it. I know I'd only be able to use it in the office, but then again no 10" screen device is really that mobile. I could live with the shortcomings.