We got lots of suggestions! I still haven't seen one, though, that really seemed to click with me. That may never happen, of course, but at least we have some good options on the table and have some idea which ones won't work.
The three we're looking at now are "Playing with Power," "The Age of Videogames/Videogame Age," and "Epic Win." I didn't realize at the time I made this poll, but there is already a documentary called "The Videogame Revolution," so that one is out.