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]
Take 36 mobile phone camera modules and put them in this and throw it in the air and you get this. Action video of Throwable Panoramic Ball Camera (seen at the top of the page). [more inside]
Here is an 80-gigapixel panoramic photo of London made from 7886 individual images. This panorama was shot from the top of the Centre Point building in central London, in the summer of 2010. [more inside]
Panoramic shots of people doing yoga in Umag, Croatia taken at sunset (1 2 3) and one in the morning. (Previously)
Arounder has an ongoing collection of high-quality full screen Quicktime VR panoramas of European cities, focusing on famous artistic and cultural landmarks (in Rome, Florence, Köln, Barcelona, Cyprus), with interactive maps and travel information. A collaboration with national tourist offices by Swiss company Vrway Communication, which also publishes Vrmag, a bi-monthly review of panorama photography, and the FullscreenQTVR directory in collaboration with the well-known panoramas.dk (previously mentioned on metafilter: 1, 2, 3, 4, 5).
This utterly stunning panorama of Paris by night (WARNING! 15000x520 image, 1.8mb) is almost too good to be true. You can see so many landmarks it's ridiculous - this version has them labelled for your convenience. I traced it back to Arnaud Friche's gallery of panoramic photographs of Paris, churches and cathedrals, and other cities. There are so many beautiful hi-res photographs here that I won't waste any more of your time talking about them.
The Louvre 360 by Virtual Sweden(?) has panoramic photos of the museum. Press 'SHIFT' to zoom in, 'CTRL' to zoom out. Panorama-o-Rama.
Taking the Long View: Panoramic Photographs, 1851-1991 ~ 4000+ images archived, courtesy of they US Library of Congress.