SMSing through GChat

Now one can SMS from GChat!!! The window is the same Chat window, making it very very convenient to send multiple smses in one shot, how much ever long, no restriction on characters!
Currently, it is available only for USians. Hope soon it starts for Asians.
The only shortcoming is, the person who is receiving the sms might get charged by the mobile carrier. That is one thing that needs to be seen. Even in Orkut, one can get alert for every new scrap, or new notifications. But, we might get charged by our mobile carriers. If they can make these too free with some short adds for short messages, it would be worth it.

How to enable this feature? Its part of GLabs, last tab under Settings.

One of the last added Lab feature is Adding any gadget by URL. I wonder, what Google, Gmail Team to be precise, has in mind. Are they planning to make this another iGoogle with a difference of emails taking priority over other stuff?