Sony's new Cybershot digital cameras have a feature that you probably won't find on any other models: a smile detector. Yes, there's software built in that can tell when your subjects are smiling and will take the photo at the appropriate time. There are three "Smile Level" settings: "'high' (to detect a faint smile), 'medium' (for a normal smile), or 'low' (for a hearty laugh)."
Call me crazy, but how hard is it to tell when your friends are smiling? Is this really necessary? I suppose if you had it set on a timer, you could have the camera wait to take a picture when everyone was smiling rather than for some arbitrary number of seconds. Otherwise, it seems like a solution to a problem that didn't exist. Keep trying, Sony.