  We examine the momentum, spin, and orbital angular momentum of structured
monochromatic optical fields in dispersive inhomogeneous isotropic media. There
are two bifurcations in this general problem: the Abraham-Minkowski dilemma and
the kinetic (Poynting-like) versus canonical (spin-orbital) pictures. We show
that the kinetic Abraham momentum describes the energy flux and group velocity
of the wave in the medium. At the same time, we introduce novel canonical
Minkowsky-type momentum, spin, and orbital angular momentum densities of the
field. These quantities exhibit fairly natural forms, analogous to the
Brillouin energy density, as well as multiple advantages as compared with
previously considered formalisms. We apply this general theory to inhomogeneous
surface plasmon-polariton (SPP) waves at a metal-vacuum interface and show that
SPPs carry a "super-momentum", proportional to the wave vector $k_{p} >
\omega/c$, and a transverse spin, which can change its sign depending on the
frequency $\omega$.
