Introducing Google Latitude

With Google Latitude, you can:

* See where your friends are and what they are up to
* Quickly contact them with SMS, IM, or a phone call
* Control what your location is and who gets to see it

From your mobile phone - View your friends' locations and status messages and share yours with them.

From your computer - View your friends' locations and status messages on a full screen even without a compatible phone or data plan.

Link and Video Here
http://www.google.com/latitude/intro.html
http://www.google.com/mobile/default/latitude.html