  We report on recent progress in understanding pairing phenomena in
low-density nuclear matter at small and moderate isospin asymmetry. A rich
phase diagram has been found comprising various superfluid phases that include
a homogeneous and phase-separated BEC phase of deuterons at low density and a
homogeneous BCS phase, an inhomogeneous LOFF phase, and a phase-separated BCS
phase at higher densities. The transition from the BEC phases to the BCS phases
is characterized in terms of the evolution, from strong to weak coupling, of
the condensate wavefunction and the second moment of its density distribution
in $r$-space. We briefly discuss approaches to higher-order clustering in
low-density nuclear matter.
