We discuss supersymmetric benchmark scenarios that take into account the precise 
constraints on the cold dark matter density obtained by combining WMAP and other 
cosmological data, as well as the LEP and other accelerator constraints.  Since the 
WMAP constraint reduces the effective dimensionality of the supersymmetric parameter 
space, one may study phenomenology along `WMAP lines' in the supersymmetric fermion 
and scalar mass parameter plane that have acceptable amounts of dark matter. We 
discuss the production, decays and detectability of sparticles along these lines, at 
the LHC and at linear $e^+ e^-$ colliders in the sub- and multi-TeV ranges, 
stressing the complementarity of hadron and lepton colliders, and with particular 
emphasis on the neutralino sector. Finally, we discuss dark matter detection and 
preview the accuracy with which one might be able to predict the density of 
supersymmetric cold dark matter using collider measurements. Based on hep-ph/0303043 
and 0306219.