On the front page I looked in vain for "log in" button. Eventually found to my surprise that clicking on "sign up" takes me to a page where I can choose between "sign up" and "log in". Do I have any reason to complain, or do I have only myself to blame? If I were more computer-savvy, I would have known that "sign up" includes "log in"?
I use the feature-request tag because I am requesting a more visible log-in button. It would be even better if MO would keep me logged in the way other stack exchange sites do.