If we're going to be serious, the thing that makes to Tour de France so boring is its complete predictability.
There will be some chaos in the first week, when there will a lot of crashes in which some so-called contenders no-one ever really took seriously will be taken out. The major names will not be effected. A few unknowns (maybe even French ones!) will have their brief days of glory in the yellow jersey, without in anyway effecting the real overall. The flat, manageable stages will be won by Cavendish. Then the terrain will tilt up, and Contador will steadily take complete control of the race. Armstrong will try to take some kind of sleazy "psychological" control of the race (by lying), but it won't matter, because he doesn't have the legs. There will be a few attacks by Schleck or some other climber, but it won't matter, because Astana and AC will have the time-frame to win completely under control.
Yawn.
To make the Tour interesting, and to actually have an exciting race, the only thing I'd really, really like to see is someone--anyone--completely unexpected win the race. Basso. Gesink. Evans. Anyone. I don't care. Anyone who could change the script and force the contenders to take unexpected risks would change the dynamic and make the race actually worth watch.