I have been using phidgets successfully for many things and I'd love to see them supported by linuxmce. The most useful and easily adopted in by linuxmce would seem to be the mains relay outputs for lights and the analogue inputs for reading temperature or motion sense, but there are many other possibilities---I've used the RFID tag reader and a relay to unlock my front door and a light sensor and servo motor to control blinds.
I've been making my own control programs with the phidgets.com C library, so if someone could just show me an example of what commands to put in the GSD boxes to read and write values using command-line tools, I'm sure I'd be able to take it from there. Alternatively, as Richard says, the phidgets.com library also includes a web-based remote API, so if someone could show me an example of how to get GSD to do HTTP GET and POST, I'm sure I'd be able to get that working too.
Thanks,
Robin.