Through the years there have been a multitude of DM Screens. Here is an attempt to showcase them in order. I suspect some may be out of order or missing completely. (I did not include every screen such as the settign specific ones, like the Eberron one, though I did decide to throw in the Kingdoms of Kalamar one since it is the monster on the bunch.)
Which is your favorite? It could be because it had the best artwork or was the most useful, but which do you like the best?