Recent developments in string theory have reinforced the notion that the space of stable supersymmetric and non-supersymmetric string vacua fills out a ``landscape'' whose features are largely unknown. It is then hoped that progress in extracting phenomenological predictions from string theory can be achieved through statistical studies of these vacua. To date, most of the efforts in these directions have focused on Type I vacua. In this talk, I will present the results of several statistical studies of the {\it heterotic} landscape. One line of investigation concerns the probabilities of realizing different possible gauge groups in heterotic string models. I will also discuss correlations between gauge symmetries and spacetime supersymmetry, and argue that that the degree of spacetime supersymmetry is strongly correlated with the probabilities of realizing certain gauge groups, with unbroken supersymmetry at the string scale tending to favor gauge-group factors with larger rank. We also find that nearly half of the heterotic landscape is non-supersymmetric and yet tachyon-free at tree level; indeed, less than a quarter of the tree-level heterotic landscape exhibits any supersymmetry at all at the string scale. Finally, I will also discuss some of the unique issues that arise when attempting to extract statistical correlations from a large data set to which our computational access is necessarily limited, and show how these difficulties may be overcome.

(based on hep-th/0602286, hep-th/0610319, arXiv:0704.1320, and other work to appear)