Mobile Form Factor I'd Like to See

I'm seeing more articles about the proliferation of Android hardware, including different form factors--eReaders, tablets, media devices. A form factor I would like to see is a two-screen folding device. No physical keyboard. So for routine phone and texting operations, you could use it unfolded, in single-screen mode. But if you wanted to do heavy internet browsing, or email, or other stuff, you would fold/flip it open. The extra screen would offer a few possibilities:

1. More real estate, for reading.
2. A "dedicated" virtual keyboard, for heavy typing. (Bonus points if the design is like a clamshell computer, allowing for the screen to be tilted at an angle from the keyboard.)
   
3. Split-screen functionality, for various forms of multi-tasking.
   

(Possible bonus points if the two halves were detachable. That might be asking a lot, and I'm not sure of the value, but something to think about.)