Teaching Orkut to talk:
Google just integrated gtalk with Orkut, If your friends are online and using Google Talk, you’ll see a brightly-colored ball by their name. Green means they’re available; orange means they’re away from their computer; and red means they’re busy. But no matter which color, if you see that ball, it means you can chat with or call your friends in just a couple of clicks.
Well to enable that you would have to go to your setting in orkut and enable it , gtalk webchat is a real cool feature and gradually google is integrating all its services together, still my favourit is the gBar for IE where you can maintain your bookmarks.