Google Latitude now on IPhone

The Google latitude location sharing application is now available for the IPhone. Can't say I have ever tried this kind of location sensitive social capability, though I could see commercial applications like stock up delivery applications in retail and maintenance crew coordination. I am sure there are a number of others. Anyone know of some in use today? Update: It is important to note that this is not a native app, but a web application running on the IPhone Safari browser.