Instagram is one of those early adopter favorites that quickly crossed the chasm to more mainstream users, at least within my social network. Take that popularity, mix it with an apparent desire to buy shirts, and it was inevitable that someone would use the Instagram API to create wearable mashups. In fact, there are at least three such services, each with its own twist.
Most people don't realize how many popular photo services like Flickr, Smugmug and Picasa offer web APIs. In this overview, we'll take a look at the breadth and power of currently available photo APIs and the types of photo mashups developers are building with them.