How To: Create a ghost effect in After Effects

Simple, yet very effective. Good Work. I've been teaching myself After Effects and it's surrounding programs for a few months now. I have a good understanding of the program, but I need to learn more techniques and functions to express myself more. As you asked people to post, I was wondering if you knew of any useful books or other sources that'd help advance my skills and understanding (I've been all around Co Pilot and Creative COW [excellent sources!]) I am going to pursue video and web graphics/design as a career, yet I need to know as much as possible before I try to create the more wild concepts of my mind on screen ( Not just sub par reflections).

Super tutorial :)