Google's latest 'Chrome experiment' is Cube Slam, a two-player online game which incorporates video chat. As well as being a massive potential distraction, it's also a neat demonstration of the WebRTC standard being used for real-time communication in an HTML5 environment.
Google's Chromium blog explains how the app can make use of peer-to-peer communications via an 'unreliable mode' option to ensure latency doesn't become an issue. Hit the post for a more detailed explanation.
Play Cube Slam, a real-time WebRTC video game [The Chromium Blog]