Four-dimensional String Compactifications with D-Branes, Orientifolds   and Fluxes
  This review article provides a pedagogical introduction into various classes of chiral string compactifications to four dimensions with D-branes and fluxes. The main concern is to provide all necessary technical tools to explicitly construct four-dimensional orientifold vacua, with the final aim to come as close as possible to the supersymmetric Standard Model. Furthermore, we outline the available methods to derive the resulting four-dimensional effective action. Finally, we summarize recent attempts to address the string vacuum problem via the statistical approach to D-brane models. 
Ralph Blumenhagen, Boris Kors, Dieter Lust, Stephan Stieberger