Send SMS text messages right from Gmail
Now you can keep the conversations going with a new Labs feature that lets you send SMS text messages right from Gmail. It combines the best parts of IM and texting: you chat from the comfort of your computer, and your friends can peck out replies on their little keyboards. Google is just trying it out for cell phones in the United States right now, but you can send texts to your friends with US phone numbers from anywhere in the world. Read more over at Gmail blog.
[Thx to anshu18]