Relating to last night's meeting on qrencode:
Look at this page from my Math1200 course:
http://math-01.cs.umanitoba.ca/math1220/frontmatter-1.html
You might wonder what possible use this might have. Despite a bulk mailing to the whole class, I still get asked for the link to this site during class. I'll just say, "Scan this!" It's nice to still have fun giving lectures.
Cheers, Michael