I was pretty skeptical about Kohjinsha's dual 10.1-incher when I first wrote about it, but it actually looks decently engineered in this video. The second display simply slides out behind the first, like on GScreen's Spacebook and Lenovo's W700.

It's slightly thicker than a normal netbook, but the insides are pretty much the same: Windows 7, 1.6GHz AMD Athlon Neo MV-40 processor, maximum 4GB RAM, and 160GB hard disk. How battery life would be affected remains to be seen.