Skype for Mac OS X
Video calling
Skype Video allows you to use Skype with a webcam to see, smile and wave to the person you are talking to. To be able to use Skype Video on your Mac you need to download Skype for Mac 2.0 beta.

To begin using the Video option, go to “Skype” > “Preferences” and click the “Video” button, then tick the “Enable Skype Video” check box. You can set Skype to start video automatically when you make a call or you can switch video on and off during the call, by clicking the video button in the call window.