  We introduce a simple family of models for representing the dark matter in
galaxies. The potential and phase space distribution function are all
elementary, while the density is cusped. The models are all hypervirial, that
is, the virial theorem holds locally, as well as globally. As an application to
dark matter studies, we compute some of the properties of gamma-ray sources
caused by neutralino self-annihilation in dark matter clumps.
