nice!!
Love the idea of using the arduino!
Always get a kick from reading hackaday and seeing what people build with these things and Raspberry Pi's.
Theres some people here
http://www.youtube.com/watch?v=CHE38...yer_detailpage trying to get this guy to give up his code, its kind of old though, lol.
Once you get the hang of the coding, the possibilities are endless with this. Could definitely do some fun stuff with the output wire of a alarm system too.