I thought that I would post this on my blog. It's a small html5 app that let's you do video calls without having an extension or plugin of any kind. Anyways in order to use this you need to have the latest Chrome Developer Channel installed you can find it HERE. But if you want to host your own you can download the files HERE. You'll need a friend to try this with. Anyways have fun!
EDIT: Well I removed the demo because someone posted a much better one HERE. Another blog post was made on WebRTC with more demos you can find it HERE.