Privacy fears increase as researchers reveal your iPhone stores long-term location coordinates and timestamps.  According to the article “Apple has made it possible for almost anybody, a jealous spouse, a private detective, with access to your phone or computer to get detailed information about where you’ve been,” said Pete Warden, one of the researchers.  The location info is stored long-term in an easily-accessible file and currently there is no way to remove it.  More details here.