Have you told your ad agency lately that you love it?
Today I tested the Educreations' screencasting app on iPad with the client-agency relationship (oops, sorry, I called it "Educreation" in the lesson).
Like ShowMe, this app lets you make and watch lessons to teach, inspire, and entertain. The two apps are very similar, but I'd give ShowMe a slight edge for its eraser icon (a bit easier to understand than the squiggly undo line on Educreations).
The source material (the stages of the client-agency relationship) are as they're defined by: Arens, William, Contemporary Advertising Ninth Edition, McGraw-Hill Irwin, 2004.