Petacchi looks really in form so he is odds on favorite for today, i believe its a similiar slightly uphill drag to the finish line like yesterday.
Just a note, at the end of today will mark Cancellara's 20th stage finishing in yellow. This puts him second all time in terms of number of yellow jersey worn by a rider who has never won a GC. He only trails Rene Vietto, who had 31 days in yellow. 1939 he had it for 14 stages, and in 1947 he had it for 17 stages. Cancellara is tied with 3 riders at 19, Rudi Altig, Dietrich Thurau, and A. Darrigade.