This piece by Jean Kazez is very good - have a look for yourself, and follow her links.
Among other things, the post raises the important question of whether we'd really want a world totally without religion. Unlike the others of the "four horsemen", Hitchens didn't. I recall watching the video discussion among the four of them that Jean refers to, and it's interesting seeing some of the conversation transcribed.
I actually have mixed feelings on this. My aim is not to eliminate religion from the world: my big thing is not atheism or anti-religion, but secular government. On the other hand, I do think that it's important to go on criticising religion, and I don't think it makes sense to criticise religious influence on political power without someone engaging in criticism of religion itself. The two go well in tandem. And I can't say that I'd be particularly sorry if no one, anywhere, took religion seriously any more.
On the gripping hand, I think I understand why Hitchens wanted ongoing argument, rather than a world where only one side speaks. There are good Millian reasons for that kind of impulse. As Mill said in On Liberty, it's better to have people around who disagree with you, forcing you to engage in self-criticism and refinement of your arguments. If that's what Hitchens means in the video, when he worries about "one hand clapping", I see his point.