The developers of the Layar Augmented Reality browser have just released a video showing early development of marker integration. This would bring in marker positioning for indoor use. This is great news, but unfortunately there is currently no known timeline for release of these features.
In the meantime, I have developed a way of using QR codes to improve Layar’s accuracy for applications where 3D models need to be fairly well placed. This works indoors and outdoors.
Please leave your comments, suggestions, and questions in the post comments – I hope you find this useful!