George Carlin has been an inspiration for me since my teens. Not content to simply continue collecting hilarious sexual euphemisms in the service of free speech, Carlin has continued to become a voice of outrageous reason for atheism and self-determination (link to 11-minute MP3).
I just found this wonderful bit he did last year for Mad TV: Touched by an Atheist.
Here is Carlin’s “There Is No God” piece, via YouTube:
And his “Words You Can’t Say On Television” piece: