The release of iOS4 included the capability of your iPhone communicating with an external keyboard via Bluetooth or even USB. So far, nobody's taken advantage of that feature.
Enter designer Altamash Jiwani who envisions a wraparound iPhone case with a sliding QWERTY keyboard and a pass-through port for charging. In Jiwani's design, the keyboard can be used either closed (covering the screen) or open, letting you see the entire screen. In essence, it would turn your iPhone into an "iBlackberry" or "iDroid."
Mind you, this is still just a conceptual prototype, but it does beg the question: how come nobody's offered up an external iPhone keyboard yet?
[Via Wired GadgetLab]