Deadlines always sneak up on me. I write them down in multiple places or have the same deadline every time, but still somehow I manage to forget about them until the day before. Or it could be that I don't forget about them, it's just my procrastination self telling me I have time.
One of the best ways that I have found to keep deadlines in mind is jotting them down at work. I have a bulletin board thingie at work that I post important things to, like the list of office numbers, poetry, meeting schedules, pictures of my kiddo. I've added a listing of the writing deadlines coming up.
I look at it about once a day and that helps me remember when I need to have things done by. Of course, that doesn't mean I get them done, but at least I don't forget about a deadline that I have written. I might forget it if it isn't written down, though...
How do you keep your deadlines straight?