Another day, another Google product for iPhone. This is another interesting one too. Google Latitude pulls your GPS data and allows you to share it with friends in a convenient map form. Potential for abuse? Possibly big. Potential to ruin teenagers lives, even bigger. No more of the ol' staying at the friends house while the friend is staying at yours but really you are both hangin' out at the lake. Sucks to be you kids!
Yes you can manually set your location or turn it off (see below)- but don't think you won't be able to tell the difference between movement and manual settings.