20 min into the video below we see Scott capturing keystroke events within the browser instance and using them to control a modelled character. The character, its surroundings, and even the whole visual rendering style can be edited in real-time with the standard Sketchup tools.
Later he shows this YouTube clip that has more advanced physics demos made with the SketchyPhysics plugin. Wow.
EA skate has just about everything I could ask for in a skateboarding game (another post entirely), but you can’t design your own spots. Next logical step? Build a skateboarding simulator based on SketchyPhysics. The spots are already waiting.