Seadragon is best known as a core technology behind Microsoft's Photosynth photo-browsing program. It's designed for zooming smoothly in, out and around photos over the Internet, regardless of bandwidth constraints or image size. Seadragon's technological trick is to store images in multiple resolutions and deliver only the bits needed to present the view a user wants at any given moment.
So why release an iPhone version? Alex Daley, group product manager for Microsoft Live Labs, said the Seadragon team wants to make sure the technology works well on everything from a wall-sized display to a mobile device.