  We present an overview of the effects of detailed-balance violating
perturbations on the universal static and dynamic scaling behavior near a
critical point. It is demonstrated that the standard critical dynamics
universality classes are generally quite robust: In systems with non-conserved
order parameter, detailed balance is effectively restored at criticality. This
also holds for models with conserved order parameter, and isotropic
non-equilibrium perturbations. Genuinely novel features are found only for
models with conserved order parameter and spatially anisotropic noise
correlations.
