While it can do some game genres well, boy, for others the iPod can be a nightmare to use. Yet those nightmares could easily be sweet dreams with an add-on like Alan Li's Iphone Gaming Pod.
His design, while sadly just a concept at this stage, is for a sleek, clip-on pair of attachments for an iPhone that add four face buttons and, more importantly, a PSP-like analog "nub".
The attachment slides around the outside of the phone, and any ports or buttons it blocks are replicated on the outside of the frame. As for how it would work, the design calls for the frame to "dock" with the iPhone, so that the buttons could be translated to the relevant screen "presses" in a game.