  Recent results for the QCD phase structure at finite temperature and
light-quark chemical potential are summarized, where the cases of N_f = 2 + 1
and N_f = 2+1+1 dynamical quark flavors are considered. Order parameters for
the chiral and deconfinement transitions are obtained from solutions of a
coupled set of truncated Dyson-Schwinger equations for the quark and gluon
propagators of Landau gauge QCD. Based on very good agreement with lattice QCD
for zero chemical potential the phase diagram in the whole T-\mu-plane and the
appearance of a putative critical end-point at large chemical potential are
studied.
