MouthOff — Another what-will-they-think-of-next app

Yet one more novel iPhone app that doesn't serve much purpose — but will likely be a success because of its novelty and creativity. When you use MouthOff, a large mouth appears on the screen. As you speak, the mouth moves. Of course, you have your choice of a variety of mouths. The idea is to hold it in front of your face, and then speak or sing or laugh or shout or scream. The wacky lips move in sync with your voice.

The developers are pretty savvy with their viral marketing, hosting a web page that features videos that people have made of themselves using MouthOff. The app is 99 cents. To join the MouthOff movement, you simply upload your video to YouTube and tag your clip with the word showusyourmouthoff.