Cfriend.
To answer the OP's question, outside of family (my sister and my 3 DDs) no, I don't have a best friend. I would like to, though. When we go out to dinner I'll occasionally see groups of women having a girls night out and I'm so jealous. I'd love to have a group of friends, or even one friend, to do that with.
I do worry about it sometimes though because I don't really interact with other adults much at all. Like the OP, I don't really consider DH a friend. We don't have much in common or spend that much time together. He has his interests and I have mine. What's going to happen when my kids grow up and move away? I'm afraid as I grow older, I'm going to end up being some sort of weird, lonely recluse.
I know that sounds dramatic but in reality, I try not to let it bother me that much. I have my family, my job, a nice home - life is good (for now, at least).