We explore static and dynamic properties of two- and three-dimensional systems of strongly interacting colloidal spheres. (quasi-two-dimensional (Q2D) dispersions of,particles interacting by long-range electrostatic and dipolar magnetic forces are investigated using Brownian Dynamics computer simulations. The dynamics of three-dimensional suspensions of charge-stabilized and neutral colloidal spheres is determined from a self-consistent mode coupling scheme. Particular focus is given to the implication of scaling and hydrodynamic interactions on the relation between static and dynamic freezing criteria. New freezing criteria are provided in terms of collective diffusion coefficients.