Ron Schott has posted gigapan photos from Organ Pipe Cactus National Monument and nearby areas around Ajo in southwest Arizona at his blog - http://ron.outcrop.org/blog/?p=348
Here's a screenshot of one of his scenes, of the Ajo Mountains, from December 26. It's made up of 161 views, comprising 1.46 gigapixels.
If you haven't looked at a gigapan photo before, go to the full image and start zooming in and moving around. The amount of detail and resolution is spectacular.