Dinesh D'Souza. Hitchens and he were friends, and agreed on a few issues (like abortion).

There really isn't anything new in terms of arguments. The theists recycle (and occasionally repackage) the same arguments they have used for centuries. They were fallacious then, and they are fallacious now. Their tomes don't change, so their arguments don't change. The science does change, and never in favor of the theists.

Hitchens could be very biting, especially if his debating opponent was a moron. I really liked this particular debate:

YouTube: Is there an afterlife? (FULL DEBATE with Christoper Hitchens & Sam Harris) (We Fucking Love Atheism)

Very civil, very calm, and the rabbis were politely eviscerated. :-)

A lot of his "God is NOT Great" tour produced some really good content. Still relevant today.

Matt Dillahunty is a beast in debates. He will attack the syllogisms, and the content.

AronRa isn't as good at debating, but he does know the phylogeny, anthropology, and paleontology. He also knows his bible (as does Matt...Matt was on his way to becoming a preacher before he realized the arguments for xianity were fallacious), and did a series where he read the Koran and had guests familiar with the Koran talking with him about it.

YouTube: Suras 64, 61, 62 & 48 (AronRa)

Matt is doing a debate project where he poses a question and then goes through it logically. But he engaged in many live debates as well.

YouTube: Video