CBS has created an app that makes an iPhone, iPad, or iPod Touch resemble a classic Star Trek communicator:
The design replicates the original series communicator seen used by Kirk and his crew and the app comes with sounds from the original Star Trek, and it even ‘opens up’ when you flick your wrist. It has a paging function that allows for interactive role playing and a full dialer page that allows access to your personal contacts.
At the link, you can view a video of the app in action.
Link via Fanboy