  This article reviews the current status of theoretical modeling of electric
dipole radiation from spinning dust grains. The fundamentally simple problem of
dust grain rotation appeals to a rich set of concepts of classical and quantum
physics, owing the the diversity of processes involved. Rotational excitation
and damping rates through various mechanisms are discussed, as well as methods
of computing the grain angular momentum distribution function. Assumptions on
grain properties are reviewed. The robustness of theoretical predictions now
seems mostly limited by the uncertainties regarding the grains themselves,
namely their abundance, dipole moments, size and shape distribution.
