Photo by Alan Grinberg

Photo details:

Canon Digital Rebel XSi.
Lens: EF24-105mm f/4L IS USM at 50 mm focal length, 80 mm equivalent.
1/640 second at f /6.3 (Manual override).
Handheld camera.
Panorama stitched in Photoshop CS3 from 15 photos taken in RAW format.
Level and contrast adjustments, with usual sharpening for web display.

Final image is 84 megapixels.

A print made in high resolution (240 ppi) would be 9+ feet long, 13 inches high.
The JPEG image displayed here is 4.2 megapixels.

The whole story can be seen here:
Mount Whitney via Onion Valley, A Grinberg on Flickr