:) just tried it, its pretty cool, but has a lot of false negatives. Opening my mouth was enough to trigger a smile and I can't even make a real smile. It was cool that it have a false trigger when I frowned.
There are all sorts of uses! For example, you could make a site called smilelinks that is automatically generated based off the webpages that make you smile. My guess is cuteoverload would dominate the list.
[0]: http://andialbrecht.wordpress.com/2009/05/09/when-merging-fa...