Flickraw is a Ruby library that provides an interface to the Flickr API. Data returned through the interface is presented in a simple and intuitive manner. Because the library's methods are fetched from Flickr when it loads, the library is always up-to-date.
Popcarte is a service for consumers, taking their uploaded photo and turning it into a card of the customer's choosing, from postcards to invitations to thank you notes, to special occasions, and then mails it out worldwide. The Popcarte API lets developers integrate the service into their apps.