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US firm Zeetoo is one company trying to solve the problem - in its case, with something called the Zeemote. It's a small handheld controller peripheral that communicates with your phone via Bluetooth, and looks a bit like one of the Nunchuks you use with Nintendo's Wii console.
We've written about this before, in connection with the game Fireworks, which is being developed by British startup FinBlade. The Zeemote is basically an analog joystick, although Zeetoo has also developed one prototype that uses an accelerometer for true motion-sensing controls and another with a trackball. The company says the technology has been validated on phones from manufacturers such as Motorola, Nokia, Samsung, Sony Ericsson and LG.