Dragging objects with MacBook Pro touch area
On my MacBook Pro 15", Mid 2012, there is a new option for dragging with three fingers in Mountain Lion. You place the pointer on the window title and use three fingers to move it around. As soon as you let go of the track pad it releases the window. To make the window stick to your pointer you tab twice with three fingers and tap again to release it.

Important is that activating three finger swipe gestures for Expose change to four finger swipes.