Check out the MS Photosynth video on the right ( thanks for the link Allanah in New Zealand ) or watch the presentation from the TED Talks March 2007, where developer Blaise Aguera Y Arcas shows how this software enables the amalgamation of pictures stored on the web tagged with a specific place tag. These images can then overlaid via Photosynth to enable zoom in and pan functions using multiple images to give depth and detail - each image is brought via the web enabling zoom by only bringing you the specific data from required images. ( you don't ever store all of the images on your pc ). Cool stuff...