Physics aspects of polarized $e^+$ at the linear collider

Polarized e- and e+ at the International Linear Collider play an important role for discovering physics beyond the Standard Model and for precisely unravelling the structure of the underlying physics. The physics programme at the first energy stage at sqrt{s}=500 GeV benefits strongly from the polarization of both beams. But also at 1 TeV as well as at a possible multi-TeV design of a linear collider, CLIC, the physics output is greatly enriched by beam polarization. An overview is given of the impact of providing polarized e+ at the linear collider in addition to polarized e- for physics studies in top, Higgs, supersymmetry and further models of physics beyond the Standard Model.