I enjoyed this book - McCandless (sp?) was definitely over the top in his romantic notion of living off the land, but, like the author, I admired his spirit to a degree.  Many people justifiably dismiss him as a nut, and that's hard to argue with.

Another good book by Krakauer is "Into Thin Air," documenting the 1996 climbing season on Mt. Everest, where several climbers (13 I believe?) lost their lives.  Krakauer was a member of one of the expeditions.