One of my colleagues, Paul den Dulk, has created an impressive open source library for tiling called BruTile. BruTile allows among others for effects similar to DeepZoom and SeaDragon. On his blog he explains very well how to use the library.
While the BruTile project itself is impressive by itself, it is even more impressive to see the application Paul developed based on BruTile for the Microsoft Surface in a relatively short time. Different information sources are combined with a gesture driven application to demonstrate the awesome power of BruTile on the Surface. The video shows just some of the capabilities of this remarkable and valuable open source project.