Can’t remember where I first ran across this: the inauguration Gigapan photo

The artist’s blog entry, How I Made a 1,474-Megapixel Photo During President Obama’s Inaugural Address explains

I made a panoramic image showing the nearly two million people who watched President Obama’s inaugural address. To do so, I clamped a Gigapan Imager to the railing on the north media platform about six feet from my photo position. The Gigapan is a robotic camera mount that allows me to take multiple images and stitch them together, creating a massive image file.