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The nucleon is an ideal laboratory to solve QCD in the nonperturbativeregime. There are several experimental observations that still lack a rigorousinterpretation; they involve the nucleon as a (polarized) target as well as abeam (in collisions and Drell-Yan processes). These data look like bigazimuthal and spin asymmetries, related to the transverse polarization andmomentum of the nucleon and/or the final detected particles. They suggestinternal reaction mechanisms that are suppressed in collinear perturbative QCDbut that are "natural" in Nuclear Physics: quark helicity flips, residual finalstate interactions, etc.. In my talk, I will give a brief survey of the mainresults and I will flash the most recent developments and measurements.Comment: to appear in the proceedings of the X Convegno su problemi di Fisica  Nucleare e Teorica, Cortona (Italy), 6-9 Oct. 2004; ws-proc9x6.cls include

PARTONIC STRUCTURE OF THE NUCLEON IN QCD AND NUCLEAR PHYSICS: NEW DEVELOPMENTS FROM OLD IDEAS