Earlier this year Google added the chat sidebar to iGoogle, which gave you Gmail-style chat in your iGoogle start page. Now they’ve expanded the chat functionality to include video chat right from the main iGoogle interface.

If you already downloaded the video-chat plug-in when it was released for Gtalk in Gmail, then you’re already set. If you haven’t done so yet, you’ll need to download the plug-in here.

Once you have the plug-in installed whenever you are talking with another person using iGoogle, GTalk, or supported third-party clients or mobile phones, you’ll be able to start a video chat with them directly form iGoogle.