Is "login" a username, or an instance of logging in (i.e. "your last login was 2 days ago"), or both? To be honest, I don't see many times when "login" is necessary. You can click "Log in" to log in, and most form fields will use "username" or "email address" rather than "login."

What do you make of "log off" vs. "log out"? I feel like I used to hear the former (and its complement "log on") somewhat often, but everything seems to use "log in/out" now.