(Credit:
Erica Ogg/CNET News)

KDDI and Yamaha's drumstick phone concept.

Then there were a host of phones whose screens and keyboards pull apart to be used separately. The Fujitsu version shown below uses magnets to connect the two pieces in the desired configuration. NTT DoCoMo was demonstrating a similar concept.

(Credit:
Erica Ogg/CNET News)
(Credit:
Erica Ogg/CNET News)
The Fujitsu [...]