The name of this group points out the similarities between the two well. I think a lot of the things we have problems with would be eliminated by small government.
Less public property means less nativity scene lawsuits. An abundance of private schools means we don't have to be annoyed when our kids go to school and say a pledge of allegiance to a state (which I personally disagree with) and a god that doesn't exist. I can't see why the government should be involved with stem cell research, whether pharmacists will prescribe plan b, or why they should have any say over marriage.
I like to think the best solution to most problems is the simplest solution that meets your goals and, as both a libertarian and an atheist, I come to the same conclusion on these issues: less government.
It seems that atheists manage to miss the mark so often. I listen to radio shows or watch videos and jump around because so many of us seem so oblivious to the simplest, most direct solutions.
So. Where do you see your atheism and politics converge?