CNet: Introducing Postagram: instantly print and ship your Instagram photos right from web or iPhone. Send high-quality photos to friends and family, anywhere, anytime.
Postagram uses the Instagram API. It requires that users have an Instagram login and the app installed on their phone. But from there, it looks like a quick procedure to select a photo from your Instagram library, put a message of up to 140 characters on it, address it (unfortunately the app can’t access your phone’s address book directly), and have it sent out as a postcard through the mail.
Postagram sends postcards from your iPhone [CNet]
This seems cool, but I would avoid this for business postcards. As convenient as it is, connecting with customers must be done in a very thoughtful manner. This is good for family and friends, though. Thanks for sharing!