We were already blown away by Johnny Lee's headtracking demo using a Wiimote, but it looks like Sony's trying to take it mainstream in a much slicker way. The company was demoing a PS3-based headtracking system at GDC that doesn't require any special IR glasses to function -- it just uses a bone-stock Playstation Eye camera to track your ugly mug around the room. Sony says it's not announcing the system for any games yet, but we can't imagine devs aren't clamoring for this to get official -- this would be amazing for all sorts of genres. Video after the break.