Gmail just keeps getting better and better!! Today, Gmail has voice and video chat built available inside of it. First of all, you will need to download the plugin. After this you will need to click on the "Video and More" button, the rest of the details on actual chatting are given in the video below. It should be noted that this video chat uses standards such as XMPP and H.264, and that it should be available to all users within the next day (not available on my account yet).