The Best of Both Worlds; The Lenovo IdeaPad U1

"The U1 is actually two computers. Detach the “display” and it turns into a tablet running Android. This half of the U1 runs on a separate Snapdragon processor and has its own connectivity (Wi-Fi, 3G), memory, storage, etc. Users can connect the base portion to an external display via HDMI and continue working with it while the tablet is off doing its own thing. The two halves aren’t dependent on each other, but they do work together."

I am torn when it comes to dual-booting type devices.  The fact that you have two computers in one hand can be beneficial, but switching between the two can be a hassle and adds to how you have to manage the device.  The U1 does look tempting and a good balance between usability and practicality.  I would probably just end up using the IdeaPad as a notebook though, since I would tend to favour having the extra power.  Can you imagine a scenario where being able to pull away the display and use it as an Android tablet is more practical?