This looks like a fantastic idea and design. Wireless shield on your Arduino and you're ready to go, or charge up your iPhone to keep controlling your remote patch via OSC. You could have a whole bunch of these with Arduinos located around a big field or campus Quad and do some pretty fun interactive stuff from a main control point and a master patch (or a dedicated iPhone/Android app that communicates with the Arduinos).

Anyway, thought I'd pass that along. Probably a lot more ideas down the road for these things!