There was a question during Harden's very poor performance against the Brewers this afternoon. Someone came in late to the game thread and asked what exactly happened to him. I mentioned he had bad command of the strike-zone with his fastball, and another blogger mentioned it was his control. I disputed this notion, and he said "those two words mean the same thing." In any event, Harden was pitching strikes, but had virtually no command on where his pitches were going within the strike-zone. It really didn't have much to do with his control otherwise he would've walked a bunch of guys; instead he was getting hit very hard all over the field. There is a nice piece on Pitching Tips Blog if anyone is interested in some clarification on the two terms.
Command- a pitcher's ability to pitch within the strike-zone.
Pitching command means being able to locate any pitch within a certain section of the strike zone instead of just trying to throw the ball over the plate with no purpose.
Control- a pitcher's ability to pitch strikes or not.
Pitcher's ability to improve control and throw strikes more consistently