Add QR-Codes to mp3 files to create mobile language labs
Use an ID3 tag editor to add a QR-Code to an mp3 file (such as a podcast episode). The one shown during the presentation was from www.mp3tag.de but most work the same way. Usually, the picture is added by clicking on "extended tags" or "album art" or "artwork."). This QR-Code could point the student to a keitai-specific web page with some kind of quiz or activity related to the listening. Note, though, that not all students have mp3 players that can display images.

(Update Feb 19, 2015: Note that this idea of using QR Codes for the podcast album art only really worked back in the days when MP3 players and mobile phones were separate devices. Fastforward from 2006 to nowadays, and it's safe to assume that students will listen to MP3 files on their phones, and the phone cannot scan a QR code that is on its own screen.)