From CNN, a story about the Badwater Ultra, which is widely considered the toughest ultramarathon. It starts in Death Valley, 280 ft below sea level, traverses 135 miles through the desert, and ends at Whitney Portals, which I think is the highest point on the PCT.
This year's winning time was a freaking incredible 23 hrs. 30 min.
http://www.cnn.com/2009/LIVING/wayof...hon/index.html
For further info and stories, check out:
www.badwater.com
Edited to say that mrc is exactly right -- it's not on the PCT. My mistake.