The Kooaba Query Ruby Sample Code by Kooaba presents how API interaction can access query features to implement into image recognition applications. Resources include searching methods in REST architecture.
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.
Looking for something cool to do but have no idea where to start? A tool like LairOut could be helpful in this situation. It's basically a web-based event directory that allows users to access information on a number of events happening in and around their location. LairOut also provides the LairOut API that allows developers to access this functionality.