it would be cool to have a device node for “ReVolt Intelli-Plug Steckdosenleiste USB” (about ~25€).
look out for a dos command line utility. you should be able to use that with ShellExecute.
here someone is talking about having programmed such a thing.
there also seems to be full linux sourcecode available which might give some more informations about the internal workings of the device. See sispmctl on Sourceforge