When loading Moodle 2.0 and you are prompted with the login page, the form is not automatically focused, so one has to either tab to the username/password inputs or click into them with your mouse or other input device. I think having the focusing behavior by default is good and expected, because I believe this was also the default in 1.9 and previous. If it wasn't, then maybe it's a good time to make it the default as well.