Make an iPhone App Using the Envato API

The app we will be creating is based off of my iPhone app, Envato Marketplace Mobile. While we won’t be recreating the entire app, this tutorial will give you a general idea on how it was created. This tutorial is aimed at PHP and JSON beginners and serves as a basis for creating more advanced PHP applications. (via Nettuts +)
(Link: Make an iPhone App Using the Envato API)