I use CMV Pro to review game videos and YouTube clips of our games and clips from other channels. Being able to play slo-mo, frame by frame, and move forward and back in 5sec increments is awesome. You have the scrubber too, and being able to pause, pinch zoom and review a play in detail helps players see the game in a way not possible without this app.
The telestrator allows sketch overlays (now in your choice of color!) overtop of a video, pictures or diagrams. Connect your iPad to a TV using Apple TV or Reflector and youve got yourself a professional coaching tool that cant be matched. This is a must have app for coaches.