Techcrunch:

A new application called Flag has launched on the App Store, promising user free photo prints that are actually free – no shipping or handling charges, no credit card required. This is possible because these photo prints will be ad-supported – that is, businesses pay to advertise on the back of the photo. Effectively, it’s an ad that people will never throw away.

This is an interesting solution but it’s not for everyone – you have to give up a certain amount of information to advertisers. That being said, I ordered my 20 prints fairly easily from the app on my phone. I’ll be interested to see how they come out.