  We review the D-formalism, a new method for determining the renormalization
of Green functions to all orders in perturbation theory. This formalism
exploits the fact that the renormalized Green functions may be calculated by
displacing by an infinite amount the renormalized fields and parameters of the
theory with respect to the unrenormalized ones. We briefly discuss some of its
main characteristics, its conceptual and practical advantages, and some new
results obtained through it.
