This 100 mile mountain bike race in Leadville, CO is August 11, this Saturday. Landis has been training is a former mtb pro prior to his roadie career. Lance was going to race, then no, then yes, now no. I'm betting he shows up. I'm thinking the Leadville veterans will kick both there butts.
Here is a little more info on it - http://www.active.com/story.cfm?story_id=12263
UPDATE - Landis finished 2nd - http://thisjustin.bicycling.com/2007/08/wiens-wins-lead.html