Interesting uses of NGS geoid and deflection models

Below are links to various places where NGS geoid and/or deflection models were put to some interesting uses:

Gravitational Potential Energy Differences from GEOID96: On the kinematics and dynamics of the western US inferred from quaternary fault data, GPS and VLBI velocities, and topography and geoid data (William Holt, State University of New York at Sunny Brook)