Agree with Chomsky and Ben. The course suits Cadel a lot. I'd even go as far to say that of the three mountain top finishes, only one can put a serious dent into his chances: Ventoux. Stage 7 is a long 7% grinder after two modest climbs, and it eases at the end. If he can handle the altitude, he'll be in good shape then. Stage 15 is very gradual and should see very minimal splits. There are two other stages in the Alps, plus the Stage 13 wildcard (no radios), that could see some splits though.
This course definitely suits JB's "Postal train" style of racing. Just have your team set a very fast pace over the last 50km or so, and let attrition take care of the rest. But I don't know that Astana has the power Postal did, or that Contador will follow that suit. I also think other teams may be able to derail that train at times with their equal strength.
If Cadel can take it easy for 16 stages, and give it everything going into the Annecy ITT he could end up in yellow. This would leave the climb up Ventoux, and I see him having some trouble there, as I don't think any one team can control that stage, and we're likely to see a blistering of attacks quite a few km from the finish.