One of the most wanted Gmail feature is here. You can now SMS your friend right from your Gmail Account. Though this service is already available in Yahoo! Messenger, i was highly needed in in Gmail or Google Talk.
You have to turn on the SMS Chat first. To do that, click on Settings, and go to the Labs tab. Scroll down until you see “Text Messaging (SMS) in Chat” and select Enable and Save Changes and then go to your Gmail account and click on the search bar. You can now enter the Mobile Number of your friend and start chatting. The recipient will receive the chat as a SMS in their mobile and can reply to that message to start chatting.

Unlike Yahoo!, where this facility available for lots of countries, Google has limited it only for US. That means, the recipients number has to be a US mobile number.
So, if you like to send free SMS from your computer, use Yahoo Messanger.
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