Using a freely available program called Zoomify from www.zoomify.com I have taken a panoramic image of Pistyll Rhaeadr waterfall which is 18,000 pixels wide by 7,200 pixels high and zoomified it using the export option built in to Photoshop CS3.
Using the navigation buttons below the image or the mouse you can zoom into the image and see parts of the Pistyll Rhaeadr waterfall in very high resolution.
The image of Pistyll Rhaeadr waterfall was produced using 3 rows of 15 images, with each image being bracketed -2, 0 and +2 stops to get the dynamic range. The final image size is 18,000 pixels wide and the the Tiff file is 1.6Gb in size which is obviously way too large for displaying on the internet.
By zoomifying the photograph it breaks the image file into individual sections of the photograph, both low, medium and high resolution versions, which are then automatically loaded as you move around or zoom into the image.