Update for USA / Canada: For a fee, you can watch broadcast video of each stage of the Tour de France live at Versus Tour de France Race Tracker.
All of the usual suspects will have Tour de France video recaps on their websites, but live streaming options for viewing the Tour de France are fairly restricted. Links below the photo.
Tour de France official site will have live updates during each stage.
Cycling.TV will have highlights videos each day.
Velonews generally posts videos of rider and coach interviews and the like.
Steephill.TV is probably the best place to turn for the latest video links.
Post your secret, pirated streaming feed to Bike Hugger TdF Hub.
See also: Tour de France for Dummies.