I use Skype every day for meetings and chat sessions with colleagues all over the world. However wouldn't it be good if such web conferencing tools were completely integrated in your web browser?
A promising development is WebRTC a technology that allows you to start video calls inside your browser and where the video window follows you even when you switch between tabs in your browser. No more Alt-Tabbing between applications and that seems like progress. WebRTC is an open code package that application developers can use to develop new web tools. It's still underdevelopment but the potential is clear. Let's see who develops the best solution.
Here's an introduction film to show what is possible though remember that this is just a basic example.