Skype is a popular and revolutionary video chat system with a memorable image and iconic sounds. The little blue 'S' icon is recognizable to many, and a charmingly simple design. However, to people who have never used the application, its doesn't quite convey 'video chat system'. In my non-professional opinion, if some small changes were made to this logo, it would make the icon more clear to first time Skype users and curious icon clickers.