Pathtrack works with Drupal's statistics module to track the paths of visitors once they enter a specific page. It creates a report to show number of visitors and the paths they took. Also has an optional CSV output.
Note that this module is still in development. The dev branch is functional, but it's output may exceed your php execution time (usually 30 seconds), Depending on the number of days you want results for, or the number of visitors your site receives.
This module was generously sponsored by Gameface Web Design, a Drupal shop specializing in module development and Drupal theming