Skype for Mac 2.0 Beta has been released with free video calling. Now you can make free one-to-one video calls to all your Mac as well as Windows contacts. You can see the video in the Skype window or a full screen. Even if only one party on the call has a webcam, the video is still shown to the other party. And if both have a camera, you get a great picture-in-picture effect.

Download link- http://www.skype.com/download/skype/macosx/20beta.html

Via Skype Beta