What is the GM's job?
As a GM, I was always frustrated when my players were unable to come up with anything more interesting than "I swing my sword at the foe". I felt compelled to come up with color text for combat myself. Yet I also felt I was taking some of the best parts of the game away from my players.
On the other hand, I find it very hard to relinquish control of the game to the players.
I know that John has been experimenting with systems where the players exert more narrative control.
So my question is - what are the core responsibilities of the the GM? When you GM, what do you see as your main job? What do you expect of the players?