
Some Discovery Channel executives stated that this decision was not influenced by the less than honorable events marring the past two Tour's - but one is left to form their own opinion.
I went out for a road ride today and actually spent some time thinking about this news while I was pedaling around. And honestly, I am happy for the Discovery Channel. I think they are distancing their name from a sport that is becoming more widely known for its losers (read: dopers) than its true, noble, clean athletes. In an age where steroid/illegal substance usage is becoming more and more evident in pro sports, little action has really been taken to discourage such behavior among athletes. Fans, teams and sponsors continue to worship athletes for their accomplishments, even amidst allegations of steroid usage.
In the days after Alexander Vinokourov and Christian Moreni were removed from le Tour, some cyclists refused to start immediately in the following stages - and sat at the starting line in protest of cyclists who seek illegal and unnatural advantages. I respected that gesture. Good for them.
And now, the main sponsor of the team that has had 8 of the past 9 Tour de France victories

I understand the argument that dopers would use - "I HAD to do it in order to be able to be competitive, and if I am not competitive, I don't get to ride." Whatever happened to good ol' sweat? If you aren't the best, well then you better work harder - or else you do not deserve to be the best. But enough negative lip-service has been paid to the dopers.
Good for you Discovery Channel. In my opinion, this is one of the few television channels that shows decent programs, and I honor their integrity. It is a shame that so many cyclists who have seemed to be honest and clean competitors (Hincapie, Leipheimer, Beppu, Popovych) are without a team.
But it just goes to show that it's not about winning, it's about how you play the game. The Discovery Channel, I think, has made a statement. They don't care that they are sponsoring the team with 8 of the past 9 Tour wins. They care that cycling is becoming a sport of cheaters, and they don't want any part of that - whether it was their team that cheated or not.