Arduino – I’m looking at doing a course on this for phun. There are a lot of cool things being done at work on this – one is an arty display that illustrates how often the stairs are used over the lifts – can this change our behaviour.
What about that building that was a giant game of snake?
Ideas please 
http://www.arduino.cc/
http://www.youtube.com/watch?v=VCvH3Tz_1iw
Brilliant. It’s open source (well the software at least). Now I want to build a robot. Or maybe a giant musical keyboard. This may not be using Arduino but I guess it could. It’s carrying on the stairs vs lift theme!
http://www.youtube.com/watch?v=2lXh2n0aPyw