Google Offers Tool to Let You Track Your Friends' Movements in real time
 

The service will indicate users' locations with a small photo icon superimposed on a map. It is initially available for the BlackBerry and devices running Nokia's S60 or Microsoft's Windows Mobile software. An Android version will follow in a few days, said Gundotra, and he expects an iPhone version will follow "very soon."
Wierd that Google's own mobile device version is not available at par with other smart phone operating systems. :winkwink:
Latitude can automatically detect your location if you're using it on a compatible smartphone -- but it's also possible to lie about where you are, by manually setting your location on a map.
That shit is scarry when you think about it because if the wrong person such as Vinny The Shark :winkwink: picks up your friend's mobile phone you can be in real trouble for not paying and getting taken care of Moe Green Special style.

I saw a iphone commercial app doing this same thing on tv