Where is full screen? Or at least expanded screen.

You know what really pisses me off about SlideShare.net and other slideshow sharing sites? There are no narrations! So half the time I don't know what the hell a slideshow is trying to say because some slides only have pictures or inside jokes or vague talking points. I really wish I could see AND hear a presentation at the same time. A presentation is about a person's idea, their voice, their viewpoint and the slides are just a visualization of that idea/voice/viewpoint. You'd be a ahead of the curve if you found a way to do that.