For those of you that use Google Latitude the true and tested "Longitude" has finally been updated to v1.6 works flawlessly w iOS 4. The nice thing about his app vs others is u can set it to update only on a time interval. Say every 60 or 90 minutes. Which really reduces impact on battery life. I've been using longitude for at least 2 years. It's a great app. Just a heads up.