  We briefly review our work about the polarized foreground contamination of
the Cosmic Microwave Background maps. We start by summarizing the main
properties of the polarized cosmological signal, resulting in "electric" (E)
and "magnetic" (B) components of the polarization tensor field on the sky. Then
we describe our present understanding of sub-degree anisotropies from Galactic
synchrotron and from extra-Galactic point sources. We discuss their
contamination of the cosmological E and B modes.
