1970s San Francisco's Castro, remembered by Dan Nicoletta.
Also via the folks at OMG!:
Giant Panorama of Obama-Biden Inaugural
"My final photo is made up of 220 Canon G10 images and the file is 59,783 X 24,658 pixels or 1,474 megapixels. It took more than six and a half hours for the Gigapan software to put together all of the images on my Macbook Pro and the completed TIF file is almost 2 gigabytes."
