We have released a somewhat preliminary build (V1.8.0) of P2140 firmware and PSUmoni software that allows you to use the USB port of the P2140 to send startup and shutdown commands to your PC. This is targeted at the laptop user so that you don't have the open the laptop and solder wires to your power switch. Please take a look at this thread on our support forum. We are interested in your feedback.

BETA RELEASE OF V1.8.0 firmware & PSUmoni2140 (3/30/07) - CarNetix Support Forum

Enjoy!