  We study the Landau-gauge quark-gluon vertex with 2 flavours of O(a)improved
Wilson fermions, for several lattice spacings and quark masses. In the limit of
vanishing gluon momentum, we find that all nonzero form factors have a
significant infrared strength, and that the leading form factor lambda_1,
multiplying the tree-level vertex structure, is significantly enhanced in the
infrared compared to the quenched case. We find that all form factors are
further enhanced in the infrared as the chiral and continuum limits are
approached.
