

It´s possible now to track your iphone without jailbreaking! Go to http://itunes.apple.com/gb/app/lati...5e30392e625d5d4509da6b32770b9902&affId=972145 and install "latitudie". It´s only 2 bucks!
It works with Google Latitude. First of all you need to activatie Google Latitude. You can do this on http://www.google.com/intl/en_us/latitude/intro.html .
When you enable Google Location History you can see where your phone was. You can also see where your phone is at the moment.
This application runs in the background on iOS4.
Enjoy!