Turn your phone into a Walkie Talkie
Hmmmm. Again with the walkie talkies.
Voxer is a Walkie Talkie application for smartphones. Voxer lets you send instant audio, text and photo messages to your friends (one or more!). Messages stream live as you talk and your friends join you live or listen later.
Voxer is available for iPhone, iPod touch, iPad and Android devices.