George Carlin is a stand-up comic, actor, pseudo-philosopher and famous atheist. He's also just released an HBO special.
See it here.
And you can visit Carlin's website here.
The above links are most definitely, completely, utterly, obviously and undeniably NOT SUITABLE FOR WORK.
It is also 1 hour and 14 minutes long, so make sure you have the time to dedicate to watching it.