Build a Pager Using Arduino, Node.js and Twilio
twilio.com
twilio.com
I was going to post something along the lines of "USELESS!!!", but then again it doesn't mean it isn't a good learning exercise.
All the same, I would quite be going around touting I've created a pager.
EDIT: Also, the use of Twillo is pretty contrived here when things like GSM shields exist. http://arduino.cc/en/Main/ArduinoGSMShield