Is there anyway I can stick some info in our url so I know where people are coming from? For instance, if I put my site up on dmoz.com, is there a way to add for instance http://website.com/ref=dmoz so in user tracking I can see that people have come to our site from dmoz? You know, info in the URL that's just for my reference.

I truly have no idea if anything like this is possible, just suddenly thought of it while I was trying to fall asleep!