Google 2-d bar code

This is how Google tries to track the equivalent of ‘clicks’ with its print ads. Quite interesting.

http://feeds.feedburner.com/~r/blogspot/Dcni/~3/191564613/zxing-1d2d-barcode-decoding-source-code.html
http://www.google.com/adwords/printads/ads/barcode/