Just released via the MMi Cydia source iLocalis the ultimate in iPhone tracking, remote control, and more.
What's that image above? That is from my account on the iLocalis website and it is where my iPhone was located 22 mins ago. With iLocalis you can set how often you want your iPhone 3g to send its current location to the iLocalis server and your iPhone will be tracked.

http://www.modmyi.com/forums/iphone-...-3g-again.html