bluewoki is a simple walkie-talkie over Bluetooth application for devices running iPhone OS 3.0. It allows iPhone and iPod Touch devices (2nd generation) to connect to each other via Bluetooth and to exchange vocal messages. The devices must be close enough to each other so that Bluetooth connectivity is available.
The source code is available at Github: http://github.com/akosma/bluewoki/ ! Feel free to use the code freely.