I hate it when people post climb times as proof of doping. Climbs are totally subjective and each is an individual effort that cannot be compared. For example Lance on Ventoux, he could have been going reasonably slowly (for a pro cyclist) up until the point he attacked and bridged across to Pantani, whilst the final section was fast the overall would be much slower. On the other hand Pete and Riche were going full bore from about 1/4 of the way up and then Chris attacked over the top, and he was only 25secs faster overall. The two cannot be compared as it's down to pacing, wind direction/strength, temperature etc etc etc...
In short too many variables to directly compare performances. Now TT's on the other hand I think can be considered closely matched for comparison, as it's a 100% individual effort over a set distance (even better if the conditions are the same, ie on the same day/time).....
I don't believe SKY are doping, and it was interesting to note that Mick Rodgers interviewed today said he thinks Froome has only improved 1 or 2% on last yr...not outside the realms of normal human development through training.