your iPhone, and your 3G iPad, is regularly recording the position of your device into a hidden file. Ever since iOS 4 arrived, your device has been storing a long list of locations and time stamps. We're not sure why Apple is gathering this data, but it's clearly intentional, as the database is being restored across backups, and even device migrations.
They also released an open-source application to map this data. Below are two screenshots of my iPhone data. One is zoomed in at the more regional level.
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