They busted out that breakout board last year, now GamePark Holdings have started selling a proper cradle for everybody's fave open source gaming handheld, the GP2X. The GP2X Commercial Interface Board Cradle is still more or less meant for developers -- it does have an RS232 port -- but it does also sport four USB ports (for connecting up a USB mouse, keyboard, or gamepad) and S-Video and audio-out ports if you feel like hooking this thing up to a TV or monitor.

Add USB to a cheap Linux based router