Well, nine stages have been raced so far, Armstrong and team Discovery Channel have faltered a bit, and Armstrong actually lost the yellow jersey today.
That Armstrong lost the yellow jersey isn't as bad as it sounds. He lost it to a breakaway journeyman who doesn't have a chance to win the Tour. Without the jersey, Armstrong and team won't have to work as hard as they would have had to to protect it. Stage 8 saw Armstrong left alone in the mountains by all but one of his teammates, Paolo Savoldelli (who won the Giro d'Italia in May), the rest of whom were suffering a bad day. His main rival, who has turned out to be Alexander Vinokourov, the Kazakh on the German squad T-Mobile (Armstrong's long time rival, Jan Ullrich's team), launched a series of attacks against the yellow jersey on the final climb of that stage, putting the hurt on Armstrong and Savoldelli.
Armstrong had taken the yellow jersey in stage 4's team time trial which his Discovery Channel team had won. Stages 5,6 & 7 were uneventful as far as the general classification, and the yellow jersey are concerned.
This tour has so far recorded the fastest times yet, averaging about 48 kilometers per hour. The blistering pace is probably what has affected Armstrong's team. After today's stage Armstrong was quoted as saying, "One of the fastest we've ever done and it's not been exactly flat either so I expect a major crash (of fitness) from riders in the next 10 days. We just can't keep up this pace."
Monday is a rest day, and Tuesday begins the first set of mountaintop finish stages, these being in the Alps.