First official iPhone AR apps
AR apps using location data on the iPhone (no video analyzing). Seems like these are available now on the app store (as of 21/09/09):
New York Nearest Subway from acrossair – NYC’s subway map
London Nearest Tube, also from acrossair – London’s Tube map
Discover Anywhere Transit – Transit information for several cities in North America.
While certainly cutting edge and putting new technology into practical use, the actual usefulness of these augmented maps remain to be seen, however.