Metro Paris Subway 3.0 from Presselite has been released onto the App Store with augmented reality features, possibly becoming the first application released to offer such functionality. Augmented reality applications utilize the iPhone’s Internet connection, GPS, Compass, and camera to overlay information atop a stream of video showing the user’s surroundings; Metro Paris Subway allows iPhone 3GS users to see nearby subway stations and points of interest. It is unclear what method the app is using to provide the background images, as it was previously believed that APIs allowing augmented reality applications to gain access to live video from the 3GS’ camera would not be implemented until iPhone OS 3.1. Metro Paris Subway is available now and sells for $1.