If you watch only one stage of the Tour de France, tomorrow and Wednesday will probably be the best days of the three-week race, as the riders will be in The Alps. Here is where it is entirely possible that an overall winner will emerge.
http://www.nytimes.com/2008/07/22/sports/sportsspecial1/22tour.html?_r=1&hp&oref=slogin

This is a photo from the Tourmalet in the Pyrenees from earlier in the race. The Alps are much more difficult.
Just a friendly cycling PSA for y'all.