Procypher Corp. has released an iPhone app that turns your iOS device into a real-live network camera. No network set-up is required; just press a button and view your iPhone cam from anywhere in the world. 

Camster Pro 2! Network Camera — available for US$19.99 at the Apple App Store — can be viewed by one or more iOS devices or web browsers simultaneously. Also, you can record in camera and viewer mode for up to 48 continuous hours. You can install Camster Pro 2! Network Camera on multiple devices for viewing and recording multiple network cameras at your home or business.

Viewer mode works on all devices running iOS 3.0 and up including the iPhone, iPod touch, and iPad; no camera is required. Camera mode works on all devices with a camera running iOS 4.0 and up including iPhone, iPod touch, and iPad.