phpFlickr is a wrapper that allows developers to easily integrate the Flickr API's functions into their PHP applications. The wrapper covers functions for authentication, caching, uploading photos, and replacing photos.
In an age where end users and developers alike are more conscious about IT security than ever, it’s little wonder that more focus is being put on finding more robust authentication methods than the simple password.
The Aviary Effects API that helps developers create their own Instagram recently made the API public and updated its developer portal. In addition, the company is offering a short-term developer contest, so you'll need to get going quickly.