I've been using it today and it's really polished. Three or four taps and you're broadcasting your location to your friend, or co-worker... no signs ups required for either party. It seems pretty safe to because you set a timer on the broadcast, specify who can receive it and even expire links early if you want to.<p>I can see this being really handy when you're meeting someone, they can see in real time how far away you are.<p>I've been using it on my iphone, and the only annoying part is that it stops broadcasting your location when you close the app (obviosuly) - but that should be fixed in OS 4.0 when they allowed background location services.