We briefly describe an on-going Survey of Interstellar Polarization in the Galaxy. We aim at improving our knowledge of the magnetic field structure of the diffuse Interstellar Medium, the ratio between the random and uniform components of the field and the scale length of the field fluctuations. Related goals are the study of the magnetic field through clouds at high galactic latitudes and across open clusters for mapping the field on small scales. An IR extension of the Survey has begun and will concentrate on the Galactic Plane. The Survey is being carried out with the IAG-USP 60-cm telescope. Future plans include the use of a 2.5m Robotic Telescope. © 2005 American Institute of Physics.