Nice work by alessandro at #mobilehci2011 on handheld 'AR' for indoor navigation http://www.google.com/m/url?client=ms-android-google&devlocsession=off&ei=VzZfTpjjBsLy8QP89sDrAQ&gl=gb&hl=en&q=http://data.icg.tugraz.at/~dieter/publications/Schmalstieg_202.pdf&source=android-browser-type&ved=0CB0QFjAB&usg=AFQjCNF6IvXB6-J2_4uFcuZI9wE4p6wsow