Anyone who has recently used one of the Bitcoin wallets on a mobile device (and some desktop clients) will have seen a Bitcoin QR code. Clearly, QR codes allow for a succinct method for transferring complex information in a reliable and error-resistant manner.
Naturally, the most obvious use of a QR code is for encoding a payment request URI. However, are there any other benefits that QR codes can bring to Bitcoin beyond this?
I'm thinking in terms of marketing, exotic transaction types that sort of thing.