At PAX Prime in Seattle, Double Fine's Tim Schafer and Valve's Erik Wolpaw gave a panel called "Plot vs. Play" in which they discussed the ongoing debate about gameplay and story. The panel was co-hosted by Kotaku's own Jason Schreier.
The whole thing was as much fun as you'd imagine. At one point Wolpaw, who tends to be something of a fount of hilarious unrealized Portal ideas at these sorts of panels, recounted an eventually canned sequence in Portal 2 in which players find (and kill) Aperture founder Cave Johnson. Well... they kill his brain, anyway. See, his consciousness is trapped inside a computer.