The whole idea of using your mobile phone's camera view as a screen on top of which to add geo-specific information (also known as augmented reality) is one of the more exciting areas in the world of mobile apps. Amsterdam-based Layar , one of the companies at pushing the boundaries of this growing movement, just released Layar 3.0 , which offers a whole slew of new ways to layer data onto the real world as seen through your phone. The company opened up its augmented reality browser to developers last summer and more recently added 3D capabilities . In a blog post , the company details how developers are using its augmented reality platform.