Recently I encounter many discussions about 2D Bar codes and that pushed me to read about the 2D bar codes. And I also download the Barcode scanner application from Android Market, it is very fast and accurate in decoding the 1D and 2D(QR) bar codes. This application is belong to the open source project ZXing. As a complement to this project, ZXing team developed a small web client to generate the 2D Bar codes for the Name card, Personal info, Web link, Calender event, GPS co-ordinates, SMS text, WiFi Network info, etc.,
Simple use-case scenario: You are organizing an event X. If anyone interested to register, they should send a short SMS to the number 12345 with text “Like to register for the EventX”. In the poster, you can include a QR code, which is embedded with this SMS detail. Interested person can simply scan code, using the mobile camera + ZXing mobile application, to send the SMS (No typing needed).