  We discuss the four-dimensional N=1 effective actions of single space-time
filling Dp-branes in general Type IIA and Type IIB Calabi-Yau orientifold
compactifications. The effective actions depend on an infinite number of normal
deformations and gauge connection modes. For D6-branes the N=1 Kaehler
potential, the gauge-coupling function, the superpotential and the D-terms are
determined as functions of these fields. They can be expressed as integrals
over chains which end on the D-brane cycle and a reference cycle. The infinite
deformation space will reduce to a finite-dimensional moduli space of special
Lagrangian submanifolds upon imposing F- and D-term supersymmetry conditions.
We show that the Type IIA moduli space geometry is captured by three real
functionals encoding the deformations of special Lagrangian submanifolds,
holomorphic three-forms and Kaehler two-forms of Calabi-Yau manifolds. These
elegantly combine in the N=1 Kaehler potential, which reduces after applying
mirror symmetry to the results previously determined for space-time filling
D3-, D5- and D7-branes. We also propose general chain integral expressions for
the Kaehler potentials of Type IIB D-branes.
