A huge photo - World's Largest Spherical Photo (18-Gigapixel Awesomeness)

Available at this site (link)
About this Photo
This is a super high resolution photo. Use your mouse to zoom in and see a startling level of detail. This image is currently (as of 12/2009) the largest spherical panoramic photo in the world. It is 192,000 pixels wide and 96,000 pixels tall. That’s 18.4 billion pixels, or 18.4 gigapixels! When it’s printed, it will be 16 meters (53 feet) long at regular photographic quality (300dpi). It was shot in early October 2009 from the top of the Zizkov TV Tower in Prague, Czech Republic.
How did you create this panorama?
I used a Canon 5d mark 2 and a 70-200mm lens, set to 200mm. The camera was mounted on a robotic device which turned the camera in tiny, precise increments, in every direction. All together, 40 gigabytes of images were shot. These images were then stitched together using PTGui. The resulting panorama was adjusted for color, contrast, sharpness, etc. in Photoshop. Afterwards, the image was cut into lots of “tiles” and uploaded to our server. When you view the image online, you only load a few of these “tiles” at one time.