  We find the action that describes the electromagnetic field in a spatially
dispersive, homogeneous medium. This theory is quantized and the Hamiltonian is
diagonalized in terms of a continuum of normal modes. It is found that the
introduction of nonlocal response in the medium automatically regulates some
previously divergent results, and we calculate a finite value for the intensity
of the electromagnetic field at a fixed frequency within a homogeneous medium.
To conclude we discuss the potential importance of spatial dispersion in taming
the divergences that arise in calculations of Casimir-type effects.
