With their fast variability time-scales, Galactic X-ray binaries provide an excellent laboratory to explore the physics of accretion and related phenomena, most notably outflows. I will review the radio properties of X-ray binaries, black holes and neutron stars, over different accretion regimes, present the proposed unified model for black hole X-ray binary jets, and discuss possible observational tests for its validity, as well as recent challenges posed by recent results.