Because a whole series of riders really impressed me with their performance. For example, today it's of course Vinokourov, but especially the performance of Jörg Jaksche - nobody in Armstrong's immediate surroundings expected that. Also, CSC's placement with three top riders right at the front - Basso, Sastre, and Julich - is great. But what's really nice is the good position of Botero and Moreau - both have definitely found their old form again. And Vinokourov's victory might compensate him for his weakness yesterday.
It's a bit of a shame that I only followed the stage with occasional glances at the ticker. But I'm here to work, so I don't want to complain too loudly.
Addendum: However, it does make me sad that Jens Voigt was taken out of the race for a 42-second time excess - in my opinion, the race management could have turned a blind eye there. On the other hand, he apparently had bronchitis, so it might not be so detrimental to his health if he doesn't continue. Whether he would have given up voluntarily is rather questionable given his attacking will.