Google has released a new feature to Google Maps, its Latitude. Its a new way to locate your near-by friends from your mobile device. You can invite friends to keep a track of their locations or allows them to keep a track of your locations. You can also manage settings in the privacy options to restrict or disable alerts to selected or all users.
To start using Latitude, just head over to http://google.com/latitude from your Android, Blackberry, Symbian S60, or Windows Mobile phone. iPhone support would be there anytime soon.