Air Cam is a video streaming and surveillance tool for Mac OS X. It allows you to stream video from a web camera connected to your Mac to an iOS device, like the iPhone or iPod Touch. Air Cam supports quite a few different webcams, and other video input devices. I only used and tested Air Cam on my Macbook Pro, which as you know, uses an iSight web camera. The application worked just fine with it.
Air Cam is made up of two different applications. The server installs on your Mac OS X or Windows computer, and a client app is installed on your iOS device. You can get the client from the App store. Once both of those apps are installed, you can connect to the server and view the video from your web camera wherever you are.
When you first run the server app, it will ask you to enter your e-mail address and a password. This information will be used to let you connect from outside your home network without knowing your external IP address. I don't think I have had a problem connecting to Air Cam in the time I spent with it. I even connected through 3G and the speed was acceptable.
All in all, this is a nice tool that allows you to setup a simple surveillance system. It supports motion detection and it can even send you push notifications to your iPhone when movement is detected. It is also very easy to setup and use.