For people who want to use QR Codes within the Flash environment, LOGOSWARE (the company I work for) has released a QR Code Reader into the Spark Project.
It is essentially a library that recognizes and decodes any QR Code from any image source.
J. Mori, T. Tsujishita, Y. Matsuo, and M. Ishizuka. International Semantic Web Conference, volume 4273 of Lecture Notes in Computer Science, page 487-500. Springer, (2006)
M. Hildebrand, J. van Ossenbruggen, and L. Hardman. International Semantic Web Conference, volume 4273 of Lecture Notes in Computer Science, page 272-285. Springer, (2006)