  D6-branes intersecting at angles allow for phenomenologically appealing
constructions of four dimensional string theory vacua. While it is
straightforward to obtain non-supersymmetric realizations of the standard
model, supersymmetric and stable models with three generations and no exotic
chiral matter require more involved orbifold constructions. The T^6/(Z_4 x Z_2
x OmegaR) case is discussed in detail. Other orbifolds including fractional
D6-branes are treated briefly.
