@Blunkhouse: Software Developers Kit.
@Joeysefika: You’re an idiot.
The Software Developers Kit is a set of tools that have been made available to developers. It contains a series of tools that will help developer in coding applications for the iPhone. The iPhone 2.0 software update will allow the applications that have been developed to be loaded onto the iPhone and be used. The iPhone 2.0 software update will also include some enterprise features.