AirPano's speciality is stunning panoramic photographs taken in flight: this plunging interactive piece above Angel Falls, the world's highest waterfall, being a wonderful example. Other pieces include the Maldives, the Great Pyramids of Giza, and Neuschwanstein Castle, Germany. A list of all the works in the catalog, and as locations on a world map. All of the linked panoramas require Flash (amd most have music, which can be muted), but the site also supports lower resolution versions for mobile devices. [more inside]
German photographer Peter Langenhahn has an unusual approach to sports photography: he combines multiple images from numerous times in the competition into a collage, with striking effects.
Scillywebcam. A frequently updated website with high quality photographs of Scilly. Here are some of my favorites.
Seb Przd's photos specialising in delightful and mind-bending spherical panoramas and conformal mappings.
A large collection of panoramic views of Norwegian cities. Possibly the largest collection of its kind, it gives you the opportunity to navigate trough Oslo, walk into certain shops or just have a look at the famous Vigeland park. With convenient clickable map.
Taking the Long View: Panoramic Photographs, 1851-1991 ~ 4000+ images archived, courtesy of they US Library of Congress.