My most successful application of QR codes has been on my resume. Each resume had a unique link to a page on my personal website/portfolio with some extra info (PDF download, link to github/linkedin/etc) and some analytics so I could see if it was getting any hits and what other parts of my site people were looking at.
Didn't expect much to come of it, but I ended up getting some positive remarks on it in interviews.
Didn't expect much to come of it, but I ended up getting some positive remarks on it in interviews.