At first I thought, this was a crap link. The image looked too small to be a "huge panorama" until I started to zoom in. Then I realized how large it truly is. Take a look at raw Tokyo.The 84 images (14x6) for this panorama were shot from a Tokyo hotel room in March 2006.
The camera used was a Canon 20D with a 17-85mm EF-S lens @ 85mm, and the images were stitched and post-processed using Hugin, autopano-sift, Nona and The GIMP. This scaled down version is 13000x5000 pixels.