  Accreting black holes and neutron stars release an unknown fraction of the
infalling particles and energy in the form of collimated jets. The jets
themselves are radiatively inefficient, but their power can be constrained by
observing their interaction with the surrounding environment. Here we present
observations of X-ray binary jet-ISM interactions which produce optical line
emission, using the ESO/MPI 2.2m and Isaac Newton Telescopes. We constrain the
time-averaged power of the Cyg X-1 jet-powered nebula, and present a number of
new candidate nebulae discovered. Comparisons are made to the large scale lobes
of extragalactic AGN. We also speculate that some emission line emitters close
to X-ray binaries in M31 are likely to be microquasar jet-powered nebulae.
