Here's a compact little feature at Editor & Publisher on how cartoonist Garry Trudeau put together Sunday's cartoon drawing on an old quote about fraternity hazing. I'm not sure of the quality of the shot Trudeau takes at President Bush here, as my experience is the vast, vast majority of fraternity hazing is done with the permission of the hazed, which would seem to me an important difference, but it's a nice look at how Trudeau assembles something like this.
