I personally would like to see a link on the top navigation bar that said membership instead of registration. It didn't even connect with me that registration was membership, so I clicked on the link on the right hand side under quick links that said buy a membership.

I think since so many of us in this community think of the language of membership when wanting to "register" for a con, calling it registration creates a little bit of a cognitive disconnect that doesn't immediately register as being the same thing.