The referrer report needs to be changed. I put a suggestion in for this in May of 2003, but I have heard nothing about it so far.
If you have a subdomain but you use a mirror as your main address - which I do, your stats will be full of your main address.
Also, it is useless for me to know that someone is coming through my mirror, since it is the only address I give out. It would not take much for the dreamhost people to make it so that a person could keep their mirror off of their stats page if they wanted that.
Why such a huge oversight?
If you are having this problem, please put it in the suggestions as well.