I recently came across this product: http://ppa-usa.com/shared-network-hub-4-port-usb.html
The only problem is, this is nearly opposite of what I need.
Ideally, I'm looking for a USB hub-like device that can accept at least two devices for input, and toggle those two devices between at least 2 PC's. The hub linked above appears to be only able to accept one device.
Does anyone know of such a product?