Image: ITmedia + DMobairu

Apparently the biggest QR Code. It mesures 10.97 on 10.97 meters. The URL is: http://www.shoeicorp.co.jp/map_qr/yanohigashi/.

Update (7.2.2007) : More images can be found here and there.

PS: This evening at our end of the year company dinner we also came up with a cool QR Code idea: use the Lego Mindstorms robots with a QR Code scanner and Lego QR Codes. The QR Codes would contain a program script as text. The robot would scan the code, read the program script and then execute it.