You can now link to the site (squint.me.uk) from a comment or description in flickr. The site attempts to show you the picture and the decoded data. Please try this and let me know how you get on.
Still lots of bugs and things to fix!
Squint (currently at Squint.me.uk) is a mash up of image sites and online QR readers to create the ability to decode QR codes in web images. (Very much under development)