Single production at hadron and photon colliders of gluinos and sneutrinos of
supersymmetric models, as well as radions of the Randall-Sundrum model, is
discussed. In the case of supersymmetry, R-parity breaking is needed in order
to produce single susy particles. Resonant production of radions is considered
at gamma-gamma collider.Comment: 3 pp. Talk given at SUSY'01, Dubna, Russia, June 11-17, 200