  We study the effect of nonuniform transverse couplings on a quasi-one
dimensional superconductor. We show that inhomogeneous couplings quite
generally increase the superconducting (pairing) gap relative to the uniform
system, but that beyond an ``optimal'' degree of inhomogeneity, they lead to a
suppression of the tendency to phase coherence. The optimal conditions for
superconductivity are derived.
  We also show that a {\it delocalized}, spin-gapped phase is stable against
weak disorder in a four-leg-ladder with moderate repulsive interactions.
