People have been complaining a lot about the riding of Cadel Evans. "Wheelsucking" seems to be the accusation of choice.
Put yourself in his shoes for a moment. You are not the strongest climber of the GC contenders, but you can hold your own if not attacked or attacking too much. You are the best time trialist of the contenders. Why would you do anything aside from keeping everyone nice and close together until the final TT? Of course you do not want Menchov or VDV to get away, because they are also very good time trialists, but otherwise you has a small cushion to give to the other GC guys.
IMHO, Evans has ridden a perfect tour to this point, and even after conceding yellow, to Frank, he has been in control of this race. He may not be the most entertaining rider to watch, but when he is wearing Yellow on Sunday it will be because he had a plan to win, he played to his strengths, and he buckled down and earned it.
Edit: I should add that I've loved watching CSC and was pulling for them (and VDV of course), not Evans. I just think Evans has had the best Tour, he has worked hard, and I think he will win. It's hard not to respect that.