It is not surprising to see Google's experiment with letting you send SMS text messages to any US number (as long as you know the recipient's carrier). I guess the fact that Google is a public company now, the pressure is on to bring more services out. Well, try this tool out (still buggy though)...I can see the use for this. The Firefox extension lets you select text from an internet page and SMS to a phone.
Send a Text Message (SMS)