I know that this has been posted multiple times, but I have never come across a solution to it, the question I'm referring to is: How do you make the mouse control the camera, such as in an FPS game?
Give this one a try. There's two degrees of motion (move a little off center and you move slowly, move far off center and you move quickly). Unfortunately, it rolls slightly when you try to move diagonally, but I put in a stand up method when you hit the spacebar to counteract it.