Where can I get this done?

I am interested in finding out more about my ancestry, and I am thinking that maybe we can use DNA in order to do this. I have heard that there is something called a DNA ancestry test, and I want to find out more about it and how it is used. Also, I would be interested in finding out where I can get this done. Does anyone know where I can find out more information, including a list of locations of labs that do this procedure? I am really interested in the possibilities that this would open up for me.