  There exists a world--wide consensus for a future $e^+e^-$ Linear Collider in
the energy range between $\sqrt{s}=500--1000$ GeV as the next large facility in
HEP. The Linear Collider has a large physics potential for the discovery of new
physics beyond the Standard Model and for precision studies of the Standard
Model itself. It is well suited to complement and extend the physics program of
the LHC. The use of polarised beams at a Linear Collider will be one of the
powerful tools. In this paper some highlights of searches for physics beyond
the Standard Model at a future Linear Collider with polarised $e^-$ and $e^+$
beams are summarised.
