If you're feeling gutsy, I found making a wireless remote control not too difficult.
I had seen the instructions Fingalo had posted for his wireless setup. I couldn't find the hardware. Instead, I stopped at the toy store and picked up a $20 remote controlled car. Specifically found one which took AA batteries because I didn't want to deal with recharging issues. When I took the car apart, I found everything was embedded on one circuit board. Plus, the voltage going to the motors was just under 5 volts (4.5v and 3v, roughly). I wired one set of wires that went to the motor to a usb cable and the to the camera. It works great.
For something like this, I highly recommend using a multimeter to check the polarity and voltages to make sure everything is in range.