Today I've seen the film Matrix Revolutions. The cinema ticket was an email with a bar code for the room number, row, and seat:
The email arrived by programming a Web Service client and calling the method RegisterUser in a web service. If you are interested, the WSDL is here: http://www.dotnetexperts.at/Revolutions/Interface.wsdl
Some client applications seemed to be "open source". I have met some non-programmers at this event ;-)
This was a cool event organized by Microsoft Austria!