If you're looking to run a successful developer program, you should probably pay attention to Mathys van Abbe. He's the founder of Mobypicture (our Mobypicture API profile), which has just celebrated its 500th developer.
Infradox serves up your archive of photo and video on a high volume basis. The Infradox API is actually two APIs: a "Partner API" and a "Back Office API." The partner API is, not surprisingly, for your partners so that they can connect live with your Infradox database. Responses are in XML.