I was walking today in Boston trying to find our one and only Jamba Juice. I had mywi on coming out of my car, and pocketed the iPhone without turning it off. I decided to whip out my iPad to see a bigger map and find out the address when I realized that the blue dot was updating live as I walked. This, along with the compass, led me directly to where i was going just as if my Wi Fi iPad had GPS. Pretty cool, to be able to share all aspects of my 3G equipment from my 3GS automatically. My iPad is jailbroken as well but I'm pretty sure i have nothing else aiding this. Is this old news? It suprised me and was extremely useful.