  We study the existence of long-lived meta-stable supersymmetry breaking vacua
in gauge theories with massless quarks, upon the addition of extra massive
flavors. A simple realization is provided by a modified version of SQCD with
N_{f,0} < N_c massless flavors, N_{f,1} massive flavors and additional singlet
chiral fields. This theory has local meta-stable minima separated from a
runaway behavior at infinity by a potential barrier. We find further examples
of such meta-stable minima in flavored versions of quiver gauge theories on
fractional branes at singularities with obstructed complex deformations, and
study the case of the dP_1 theory in detail. Finally, we provide an explicit
String Theory construction of such theories. The additional flavors arise from
D7-branes on non-compact 4-cycles of the singularity, for which we find a new
efficient description using dimer techniques.
