Is it possible to shutdown or restart a Logitech Revue without pulling the power cord?
Google's support page provides this option:


  To Reboot your Google TV:
  
  To reboot your Sony TV or Bluray player or your Logitech Revue, press
  Control + Alt + Backspace on your controller.


If you had adb connected you could also try adb reboot, which works on other devices.