Last week I came across this video of the iControl Pad, a peripheral for jailbroken iPhones that gives you a joypad for your iPhone. This enables you use emulators to play all the great games of yesteryear.

Despite the clunkyness, the control pad seems quite usable, and it appears to have a built-in battery to keep your iPhone charged while you game away! I never really thought of playing old games on my iPod Touch, but the graphics look amazing! Now if they could use WiFi or bluetooth for network play ;-)