The JMT is roughly 207.5 miles long, from Happy Isle to Mt. Whitney. But you still have to get to Whitney Portal to get off the trail so it is actually 213.5 miles. The trail follows lush meadows and high alpine tundra through the Sierra Nevada of California. (The mileage is from "The John Muir Trail" by Don and Roberta Lowe). I am planning this trip for 2006 and probably will not get to do it until 2007. This gives me plenty of time for planning. Also, the maps are organized from South to North, this is because that is the way I am section hiking the PCT.
Excellent information and books about the JMT can be found at:
JMT Topo Map Series With UTM Coordinates and grids This series of free JMT Topo maps can be viewed on line and printed or the entire series downloaded.
Other Links of Interest: JMT Overview from the Fresno Bee Newspaper JMT Profile - NIce elevation profile by Brian O'Kelly from the K Aston website. Books by John Muir the author can be found here. PCT LInks Page - Find other links that will be of use here OTT Weather Forcast Page - Click on Central Califronia link
Search this site:
John Muir Memorial Rest Hut on Muir Pass - 11,995 ft
Built in 1930, and dedicated in 1933, see nice set of pictures here.