If you think that it is not enough with the single screen device then Samsung has something here new for your selection. It is dual screen Galaxy Tab. Of course Samsung has already a wide range of selection for its device from 3 inches to 5.3 inches for its Galaxy Note.
Learning from unofficial information on the net, Samsung might be in developing stage of dual screen Galaxy Tab with 7 inches each making it similar to Sony Tablet P.
However the two screens are used for different purpose leaving one as keyboard while you can enjoy the other screen as display. Regarding to operating system, Samsung will push Windows 8 thanks to close relationship with Microsoft.