Augmented reality on the iPhone is really taking off. A load of apps have already surfaced on Apple’s App Store, while many more are in the pipeline. The reason? Everybody was waiting. Waiting for Apple to update the iPhone software to 3.1. That gives developers the ability to lay data over the camera viewer, and these apps can take full advantage of this new capability. However, you will need an iPhone 3GS with its extra graphics grunt to take advantage of these apps - the old-skool har