  We describe the computation of SUSY-breaking terms on a D3-brane in a quite
general type IIB supergravity background. We apply it to study the
SUSY-breaking induced on the D3-brane world-volume by the presence of NSNS and
RR 3-form fluxes. We provide explicit general formulae for the SUSY-breaking
soft terms valid for the different types of fluxes, leading to different
patterns of soft terms. Imaginary anti-selfdual fluxes with G_3 a pure
(3,0)-form lead to soft terms corresponding to dilaton-dominated SUSY-breaking.
More general SUSY-breaking patterns are discussed, arising from more general
fluxes, or from distant anti-D3-branes. The known finiteness properties of
dilaton-dominated soft terms are understood in terms of holography. The above
results are interpreted in the context of the 4d effective supergravity theory,
where flux components correspond to auxiliary fields of e.g. the 4d dilaton and
overall volume modulus. We present semirealistic Type IIB orientifold examples
with (meta)stable vacua leading to non-vanishing soft terms of the
dilaton-domination type. Such models have many of the ingredients of the recent
construction of deSitter vacua in string theory. We finally explore possible
phenomenological applications of this form of SUSY-breaking, where we show that
soft terms are of order M_s^2/M_p. Thus a string scale of order M_s=10^{10}
GeV, and compactification scale three orders of magnitude smaller could explain
the smallness of the weak scale versus the Planck mass.
