  We forecast constraints on primordial non-Gaussianity achievable from
forthcoming surveys by exploiting the scale-dependent halo bias introduced on
large scales by non-Gaussian initial conditions. We explore the performance of
exploiting both the shape of the galaxy power-spectrum on large scales and the
cross-correlation of galaxies with Cosmic Microwave Background maps through the
Integrated Sachs Wolfe effect. We find that future surveys can detect
primordial non-Gaussianity of the local form with a non-Gaussianity parameter
$|f_{\rm NL}|$ of order unity. This is particularly exciting because, while the
simplest single-field slow-roll models of inflation predict a primordial
$|f_{\rm NL}|\ll 1$, this signal sources extra contributions to the effective
$f_{\rm NL}$ of large-scale structures that are expected to be above our
predicted detection threshold.
