  We study the prospects for detecting gamma-rays from decaying Dark Matter
(DM), focusing in particular on gravitino DM in R-parity breaking vacua. Given
the substantially different angular distribution of the predicted gamma-ray
signal with respect to the case of annihilating DM, and the relatively poor (of
order 0.1$^\circ$) angular resolution of gamma-ray detectors, the best strategy
for detection is in this case to look for an exotic contribution to the
gamma-ray flux at high galactic latitudes, where the decaying DM contribution
would resemble an astrophysical extra-galactic component, similar to the one
inferred by EGRET observations. Upcoming experiments such as GLAST and AMS-02
may identify this exotic contribution and discriminate it from astrophysical
sources, or place significant constraints on the mass and lifetime of DM
particles.
