Discrete torsion, AdS/CFT and duality

We analyse D-branes on orbifolds with discrete torsion, extending earlier r esults. We analyze certain abelian orbifolds of the type C-3/Gamma where Ga mma is given by Z(m) x Z(n), for the most general choice of discrete torsio n parameter. By comparing with the AdS/CFT correspondence, we can consider different geometries which give rise to the same physics. This identifies n ew mirror pairs and suggests new dualities at large N. As a by-product we a lso get a more geometric picture of discrete torsion.