Location Based Future

"AppleInsider is reporting that Apple has been working on OS-level integration of an geographical mapping technology as an integral part of Leopard, its next-generation OS. The technology is rumoured to employ GPS functionality. Will GPS chips make Apple iPod phones and MacBooks location aware? Users would be able to post information at a location, hanging in the air, ready to be browsed by people passing by. Imagine getting highly relevant messages, without even pressing a button, simply because you are in the vicinity and your preferences match the content of the post."

Image being able to locate someone when they are stranded on the side of the road, in an AAA type situation. Instead of multiple phone calls, trying to describe that you are between a phone poll and a bush on the side of the road, you can be accurately located. This obviously brings up relevant questions of permissions and security. Under what circumstances would you allow someone access to you and your phones location?