Since Windows 8 launched last fall, we've seen a slew of convertible Ultrabooks, but we've never seen anything like the ASUS Taichi 21. This 11.6-inch wonder has a second screen on the back of its lid. Close the lid and this second display serves as a tablet. Leave the clamshell open and you can use the second screen to show a presentation to the person sitting across from you. At $1,299 to start ($1,599 as configured), the Taichi 21 includes other goodies such as 1080p resolution on both displays and premium Bang and Olufsen speakers.