  The ``exotic'' particle model with non-commuting position coordinates,
associated with the two-parameter central extension of the planar Galilei
group, can be used to derive the ground states of the Fractional Quantum Hall
Effect. The relation to other NC models is discussed. Anomalous coupling is
presented. Similar equations arise for a semiclassical Bloch electron, used to
explain the anomalous/spin/optical Hall effects.
