We study the infrared behaviour of QCD Green's functions in the
framework of Dyson-Schwinger and Bethe-Salpeter equations.
We discuss a selfconsistent analytical solution for the 1PI-Green's
functions of Yang-Mills theory in Landau gauge. The resulting
running coupling has a universal fixed point in the infrared and is
invariant in transverse gauges. We present numerical results for the
ghost, gluon and quark propagators and discuss the effects of
dynamical chiral symmetry breaking. We determine unquenching effects
in light meson observables and compare our results to the available
lattice data.