Here's an interesting article about a patent filed by Apple for a two way screen. That is to say an LCD screen that has composite image sensors embedded between the LCD cells.
New Scientist Article (http://www.newscientist.com/article.ns?id=dn9059&feedId=online-news_rss20)
Perfect, now there will be a pile of webcams out there that people do not know they even have...
Wonder how they compensate for the glow and light emited from the LCD it self.