CBS has just posted a new app to the Apple App Store that turns your iPhone into a Star Trek communicator. You can flip the communicator open by flipping the phone and it includes all sorts of Original Series sound effects. Even cooler there is a phone app included, which can access your contacts, so you can make calls right from the communicator.
Star Trek die hard fans will simply love this app. Currently it is priced at $.199 so go to the iTunes store if you cannot wait for it to go cheaper.