  We present the superconformal gauge theory living on the world-volume of D3
branes probing the toric singularities with horizon the recently discovered
Sasaki-Einstein manifolds L^{p,q,r}. Various checks of the identification are
made by comparing the central charge and the R-charges of the chiral fields
with the information that can be extracted from toric geometry. Fractional
branes are also introduced and the physics of the associated duality cascade
discussed.
