  The past year has witnessed a large increase in our knowledge of the
polarization properties of Gamma-Ray Burst (GRB) radiation. In the prompt
phase, the measurement (albeit highly debated) of a large degree of linear
polarization in GRB 021206 has stimulated a deep theoretical study of
polarization from GRB jets. The optical afterglow of GRB 030329, on the other
hand, has been followed thoroughly in polarimetric mode, allowing for an
unprecedented sampling of its polarization curve. I will review the present
status of theories and observations of polarization in GRBs, focusing on how
polarimetric observations and their modelling can give us informations on the
structure and magnetisation o GRB jets which is not possible to obtain from
their light curve.
