Always an interesting topic!
I, for one, have wanted to have kids for a while now. I want to share the joys of Christmas, birthdays, and all that other shit that goes with them. I want to experience seeing my kids having the joy that I never got to have, and perhaps even get a little joy from it myself.
I sorta like the idea of passing down my values to a child (I know others on here would think it's scary, LOL!)
However, I know that there's some people out there that have no desire to have kids. They enjoy the single life, their "freedom", and having all they posess to themselves. There's absolutely nothing wrong with that IMO.
My own personal feelings on the subject are wanting to experience that piece of life before it's too late. The problem I had for a while was thinking, "would I ever find someone worthy of bearing my children?" I contemplated this for a while, and my solution (if I found noone) was to try and adopt later on in life. However, it looks like I won't have to go that route ;)