In 2004 Scott Williamson became the first person to "yo-yo" the Pacific Crest Trail in one year. That is, 2650 miles hiking from the the southern tip of California through Oregon and Washington to Canada, and 2650 miles back. Last spring, Steve Friedman wrote "The Unbearable Lightness of Being Scott Williamson". It's not so much about the nuts and bolts of hiking, but the emptiness and obsession. Good stuff. From what I hear, Williamson is one of the most humble people out in the hiking world. I believe he's also attempting a repeat this year.