I just noticed that when not logged in, I have "sign up" and "log in" links on top:
Not sure how long it's like this however both link to http://stackoverflow.com/users/login.
As I understand it's by design (?) two have to links with different words point to the same page, I think we better remove the "sign up" as it's just confusing. (unless it will point to http://stackoverflow.com/users/login#create-account which indeed give the user option to create new account in one step)
This happens on all sites, except Meta.