Topic: IR remote interface
An IR interface for Chumby would be very handy, so you could use a TV-Remote style controller for it. I can think of a lot of situations; say for the Chumby on the kitchen counter or living room, where using an IR remote would be the easiest way to flip through your MP3s or Internet radio stations
Bluetooth would also be handy; with a headset you could use it as a VOIP phone, or have a bluetooth keyboard for quick email/IM. (OK, a BT keyboard is half the cost of the Chumby...maybe a wire wouldn't suck...)