I am taking a trip and I have some folks who will probably be interested on seeing where I am at a given time. Since the iPhone has Location services and sharing I figure there might be an app for it? Is there?
Since they can't run in the background, it wouldn't work very well... at all. You'd have to put off using the phone at all the entire trip and just let the app stay open the whole time to track you.
I found one...Instamapper
Yes, if the other people have iPhones or other loopt-compatible phones (there are quite a few -- check out the loopt website), loopt is pretty nice. Not only can others see where you are, but you can also link with facebook and twitter (people can see your loopt updates there).Loopt allows you to do it if the other person has an iPhone, and it's much preferred quite honestly since I doubt your folks will be looking at you 24/7
The app GPS Tracker allows you to do this online.
I used GPS Tracker during a recent cross country trip and it worked well. It even embedded a map with position into my Facebook page. I only updated my position about every half hour though rather than leave it running since I didn't have a charger in the moving truck.
eta: looks like what I called GPS Tracker and Instamapper are the same thing.