Apple Thoughts: New Loopt for iPhone

"Find out who's around, what to do, and where to go. Introducing background location sharing on the new Loopt so you can always stay connected with your close friends and family."

New in version 3.0.0 is the ability to constantly update your location as a background task, and to get push notifications from nearby friends. Also new with this version is a new, easier-to-navigate home screen, the ability to discover favorite places from the Loopt community, and the ability to keep track of "favorite" friends. A nice upgrade to an already free product.