The people from Varasoftware have produced what I would call a premiere screen capture utility for Mac OS X, ScreenFlow. ScreenFlow is incredibly useful in that once your recording is done, you use the built in editor. This editor allows you to add mouse/click effects, show key presses, and zoom/pan, and show a spot light. You can also mix in webcam shots, this is all done before even exporting the video. ScreenFlow costs $99 from Varasoftware.