I was called into complete a Face Recognition Flash app for MySpace last week. It was a promo for the Black Eye Peas.
After you give permission for Flash to turn on your camera, it locks in on your face (center your face for this) and then song begins. Cute 8bit art gets blasted on to your face (sunglasses, old game icons, etc). You can move your face around and the art will follow you. And then you can snap stills of the silliness with a button. When the song ends you can select screen grabs to upload to your MySpace account.
We did encounter one problem with Flash accessing the camera on some macs. Apparently there is a bug with Mac OS 10.6.5 and the camera. However there is a work around.