No. 2: Toshiba libretto W105
This two-screener appears to have a bit of an identity crisis. On the one hand, it's like a netbook with a second screen in lieu of a keyboard. On the other, it's like two tablets sandwiched together. And it runs Windows 7 Home Premium (32-bit).
The two LCD screens are both multi-touch and measure 7 inches diagonally. The libretto can be used where both screens show images in portrait mode, or positioned horizontally where the images are displayed in landscape format. In this orientation, you can touch type on a virtual on-screen keyboard running on the lower screen to use the libretto W105 like an ordinary netbook.
The libretto W105 was released in August, but is presently sold out from Toshiba's Web store, despite having been priced at a hefty $1,099.99. Stock is said to have been limited, as Toshiba reportedly intended only to manufacture a limited number of them. (A few online retailers are still selling them, but your best bet may be to go on eBay to try to snag one.) Yet the fact that the libretto W105 sold so quickly suggests that there could be a worthy market for small-form factor notebooks with two screens.