He delivers a good rant on 9/11 commemorations, god, religion, money, and the war on terror.
Interestingly, I noticed that Maher called himself an atheist. He used to studiously avoid that label and make a point of saying that he was an agnostic. His Wikipedia page says the following (with citations and links removed):
Maher is highly critical of religion, and views it as not worth the bother. He is described as an agnostic, and refers to himself as one in his feature film Religulous. As for labels, he has denied being an atheist, saying, “I’m not an atheist. There’s a really big difference between an atheist and someone who just doesn’t believe in religion. Religion to me is a bureaucracy between man and God that I don’t need. But I’m not an atheist, no.” He has also stated that he is a deist. Maher has also occasionally referred to himself as an “apatheist”, saying “I don’t know what happens when you die, and I don’t care”, adding, “there’s Atheist and there’s Agnostic, and I’m okay with us not splitting the difference on those; if you are just not a super-religious person, you are on my team”. He has reiterated his stance in subsequent interviews, rejecting both the certitude of the existence, as well as the certitude of nonexistence of deities, concluding, “I’m saying that doubt is the only appropriate response for human beings.”
I am not sure what changed his mind. It is not important but may symbolize the fact that more people are getting a better understanding of the fact that being an atheist does not mean having a sense of certitude that god does not exist but realizing that god is a totally unnecessary concept.