  The last decade has seen a leapfrog in the interest in X-ray polarimetry with
a number of new polarization measurements in hard X-rays from AstroSat, POLAR,
GAP, and PoGO+. The measurements provide some interesting insights into various
astrophysical phenomena such as coronal geometry and disk-jet connection in
black hole X-ray binaries, hard X-ray emission mechanism in pulsars and Gamma
Ray Bursts (GRB). They also highlight an increase in polarization with energy
which makes hard X-ray polarimetry extremely appealing. There is a number of
confirmed hard X-ray polarimetry experiments which along with the existing
instruments (AstroSat and INTEGRAL) makes this field further exciting.
Polarization experiments may also see a significant progress in sensitivity
with new developments in scintillator readouts, active pixel sensors, CZT
detectors. In particular, the advent of hard X-ray focusing optics, will enable
designing of compact focal plane polarimeters with a multifold enhancement in
sensitivity. In this review, we will focus on the recent polarimetry findings,
science potential of hard X-ray polarimetry along with possible improvements in
the measurement techniques.
