[r0muald]

Printable URLs are a good use case, but printed material has the annoying characteristic of lasting longer than your average web service, including URL shorteners. For printed stuff QR codes are still the most practical option IMHO.

[normloman]

The click through rate on QR codes is terrible. The two biggest mobile OSes don't have a qr reader installed, ordinary people don't know to download the reader and decode them, and even people with QR readers don't bother to open the app when they can just type the address.

Besides, most QR codes just point to a bit.ly URL anyway (It's a cheap way to track QR usage separately from direct traffic).

[sspiff]

They also have the annoying characteristic of lasting longer than the content they link to more often than not!