Skype 4.3 screen sharing in group call
Solution 1:
This does not work on Linux for the moment. See this question: Unable to do group video call and group screen share using Skype 4.3
or this Skype forum: http://community.skype.com/t5/Linux/Skype-4-3-0-37-There-s-no-screen-sharing-and-video-chat-in-the/m-p/3558973#M10792