I would like to see this implemented too.
Posted under General
It's not on the front page (http://danbooru.donmai.us/).
I've checked.
You have to either click the >>, navigate inside and click My Account (which you may have to wait to do if there are too many free users online), or manually go to http://danbooru.donmai.us/user/home and log in.
i raised a trac for this
Anyone who can't type http://danbooru.donmai.us/user/login from memory doesn't deserve a privileged account! 8O