This is a question with a couple different answers depending on what you mean.
If you mean, "What kind of woman do I find physically attractive," I like short chicks that are a little on the plump side. I also have a particular attraction to either redheads or Asian chicks.
If you mean, "What kind of woman would I like to be in a relationship with," then those physical characteristics become less important. Instead, I'm more worried about overall compatibility. I want a woman who is emotionally mature and ready for a serious relationship. Someone who would like to have a big family (I want four kids), and young enough to still do so. Someone who has a fair amount of interests in common with me. Someone who can accept me for who I am, with all my quirks, faults, mistakes, and eccentricities, without trying to change me. Someone with a good sense of humor, but who can be serious when necessary. Someone that is very understanding (I have a lot of insecurities and issues from being hurt too many times, so she has to be understanding and patient enough to work through them with me). Finally, someone who will help motivate me and inspire me to do the things I want to do and know I'm able to do, but just have trouble accomplishing by myself.
I know that there is at least one woman that fits most of these criteria and I want so badly to get to know her better, but alas, I don't think she has really noticed me.