UNICEF: Scan & Help

If a person in a developing country could reach out to you directly and ask for your help, wouldn’t you give it to them? That’s the premise behind SCAN AND HELP, a display advertising campaign that uses Mobile Tags to connect people in the first world with people in developing countries.

Scanning the tag will launch an augmented reality application that will let users explore the environment of the person on the poster (who may be a relief worker or aid recipient).
via: PSFK

Unicef went a step further by also integrating deals with sponsors/partner discounts offering discounts at retailers in catalogues (using mobile tagging) and as part of the checkout process, users would be able to donate the money they saved to a campaign or in store where they would have the option to donate then or at checkout. Tags would be integrated in to the retailer’s POS system so the cashier could scan the Mobile Tag and log the donation as easily as scanning a traditional barcode.

I've often thought this a sweet spot for charity organisations, we know people spend to feel good, we also know that altruism makes you feel good too, lets connect those experiences.