  I present an overview of past, present and future research on microquasars
and jets, showing that microquasars, i.e. galactic jet sources, are among the
best laboratories for high energy phenomena. After remindind the analogy with
quasars, I focus on one of the best microquasar representatives, probably the
archetype, namely GRS 1915+105, and present accretion and ejection phenomena,
showing that only a multi-wavelength approach allows a better understanding of
phenomena occuring in these sources. Thereafter, I review jets at different
scales: compact jets, large-scale jets, and the interactions between ejections
and the surrounding medium. I finish by speaking about microblazars and
ultraluminous X-ray sources.
