Recent progress in plasma polarization spectroscopy (PPS) research is reviewed. Besides discharge plasmas and solar plasmas, the first class of plasma which has become the subject of PPS research is laser-produced plasmas. Polarization is observed for emission lines and recombination continuum, indicating a spatially (directionally) anisotropic velocity distribution of electrons, especially in very-low-energy regions. Tokamak plasmas are the second class; impurity ion lines are found polarized. A kinetic model, the population-alignment collisional-radiative model, was constructed and the experimental line intensity and polarization are interpreted in terms of the electron velocity distribution function. Recently, atomic physics relevant for PPS has made substantial progress. Several facets, experimental and theoretical, are mentioned.