Here's a screen cast of a small application I thought up to let students text message me in big classes like EC4004. The application works pretty well with my Sony W200i, but it might work with other phones as well. Drop me a mail if you're a lecturer interested in using this thing, or even better, if you'd like to help me make it more extensible.
My Text Message Doo-Hickey from Stephen Kinsella on Vimeo.