List of registered runners for UTMB is online. There will be about 2300 runners. The race will start on Friday, August 26th, 2011 at 6:30 PM in Chamonix, France. The 166 km, +/- 9500 m route will be the same as in previous years.
[By the way, I wonder why don't they start a few hours earlier on Friday, so they wouldn't have to worry about some vandals stealing the course lights again in that difficult section traversed at night? It would be a pity to see the de facto 100-mile Trail Running World Championship be cancelled for the second time in a row.]
The list includes Kilian Jornet, the best young European ultra trail runner (23 years old; 2008 1st, 2009 1st) as well as Marco Olmo, the best old European ultra trail runner (62 years old; 2005 3rd, 2006 1st, 2007 1st).
American elite competitors include Geoff Roes, Anton Krupicka, Scott Jurek and Karl Meltzer.