The continual evolution of contemporary screenwriting.
From my vantage point, the craft of screenwriting today has evolved, and is continuously evolving into what I call a "revolutionary form." Look at: Atonement, Vantage Point, Slumdog Millionaire or Inglorious Basterds. Almost every film being released today uses elements of voice over, sub-titles, flashpresent, interviews, or other elements of a multi-media presentation. To me, it is the mark of a new style of screenwriting.
Why is this happening? Well, I have a "theory" about that. I believe that this "new" style of screenwriting is evolving through the influence of technology. And it's creating a "revolution" in the way we're writing our screenplays. This is what I'm talking about in terms of the Evolution/Revolution of the modern screenplay. Take a look and check it out.