Google’s rolling out Video/Audio Chat in Gmail. That’s a picture of the settings with my mug on video.
Want to try it for yourself? You’ll need a Gmail account… then go to http://www.gmail.com/videochat
and install the plug-in. After you get it installed, it should take you to the Settings->Chat menu where you can configure your camera.
If you don’t see it, Google hasn’t activated it in your account yet. Be patient. It wasn’t on for me earlier this evening and when I checked again, it was up and running.