QR Codes... What are these things?
A QR code is a "quick response" code. It is a matrix bar code which can store information. These can be read with QR reader software or apps and created online or via apps.
QR Reader software for Windows, Mac or Linux computers (desktop or laptop machines must have a webcam or a built-in cam to use): QRReader http://www.dansl.net/blog/?p=256
A Firefox Addon: https://addons.mozilla.org/en-us/firefox/addon/mobile-barcoder/
SpecialQRVoice http://qrvoice.net/ Creates a "speaking" QR Code using text-to-speech
Educational Implementation Ideas: