Vitrification in colloidal systems typically occurs at high densities driven by sharply varying, short-ranged interactions. The possibility of glassy behavior arising from smoothly varying, longranged particle interactions has received relatively little attention. Here we investigate the behavior of screened charged particles, and explicitly demonstrate that these systems exhibit glassy properties in the regime of low temperature and low density. Properties close to this low density (Wigner) glass transition share many features with their hard-sphere counterparts, but differ in quantitative aspects that may be accounted for via microscopic theoretical considerations.PACS numbers: 64.70. Pf, 61.20.Lc, 82.70.Dd The origins of the precipitous slowing down of dynamics in supercooled liquids are still unclear even after many decades of intense scrutiny. Model systems often form the basis for detailed investigations that include the core features known to give rise to generic glassy behavior. Perhaps the most prominent example of such a model system is the hard-sphere suspension, which has served as the basis for numerous experimental, theoretical and computational studies of the glass transition [1,2,3]. Many of the most interesting properties of supercooled liquids and glasses, including two-step relaxation, stretched exponential decay of density correlations and dynamic heterogeneities occur in hard-sphere systems [4,5,6].While the glass transition of hard-spheres has become a paradigm for vitrification at high densities, serving as a reference point for conceptual attempts to connect the behavior of physically diverse classes of disordered arrested states of matter, another physically important limit of glassy systems has received much less systematic scrutiny. This limit is that of a dilute assembly of particles interacting via long-ranged, soft repulsive forces such as those arising in charged systems. Over twenty years ago Chaikin and coworkers [7,8] investigated the phase behavior of dilute suspensions of charged colloids. Low density glasses stabilized by Coulomb repulsion were called "Wigner glasses" [7]. At that time a detailed investigation of the structure and dynamics of these suspensions was not carried out. Hints of glassy behavior in one component plasmas have also been noted [9], and the notion of a Wigner glass has been revived in colloidal systems [10,11,12,13] due to recent activity focusing on physical gelation in charged systems [14,15,16,17,18]. Indeed, the study of glassy properties of dilute Coulomb systems has consequences that reach beyond classical systems and may shed light on routes to the formation of glasses in electronic systems [19,20], where glassy effects might persist even in the limit of weak to vanishing quenched disorder [21]. Such self-induced glassiness results from electron-electron interactions, an effect analogous to classical Wigner glass formation in colloidal systems.Similar to the experimental situation, few theoretical investigations of the emergence of glassy dyna...