I've read and enjoyed: To the Top of Denali by Bill Sherwonit (a collction of stories on Denali) and Minus 148 by Art Davidson (the story of the first winter ascent of Denali).

I just finished Into the Wilderness . The book spent a lot of time on McCandless' back story and others who seek the wilderness experience. It focused a little on his experience in the Alaskan wilderness as there is little information other than his journal (mostly listing his meals) and photographs that were left by him. I can respect his desire to be in the wilderness, but I was shocked by his utter lack of respect for the surroundings into which he moved. He was absolutely unprepared for his adventure. In his time in Alaska, he lived ten miles down a trail, across a river. He crossed the river during a time when it was low and got stuck on the wrong side as the snow melted and the river rose into a raging torrent. If he'd had a map, he'd had a better chance at making it out (ten miles back own the trail to a road) in the Alaskan summer. Krakauer did an excellent job researching his backstory and paited a picture of a boy who had little respect for anyone but himself.

I have Krakauer's Into Thin Air still to read. (Everest ascent and disaster)