Interesting product, not sure how well it will do in the marketplace. I think the dual-screen idea worked great in a smaller form factor with the Microsoft Courier (RIP), not sure if one this size is going to work out well for Acer. Perhaps a little too ambitious.
Update 12/10/10: They’ve announced a price of €1499. That is almost $2000 USD! Not a chance this thing is going to sell well. If you’re ready to spend that much on a computer, get a MacBook Pro or something.