One of the most-used gimmicks was the QR Codes. They were everywhere, and many sessions gave some great ideas how to use them. One of the better online sites where you can generate your own codes is here. Of course, a major restriction is having the scanner(s) to reveal what the codes are. At the conference, it was suggested the students use iPads, or use the classroom computers with video cameras attached to the monitors.
I heard a few teachers mention that the codes for classroom use are more gimmick than practical. Personally, I agree (as of now.) But to me there's always a time and place when the codes can be used for a special assignment, and not necessarily for everyday use.
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