  We consider models of light super-weakly interacting cold dark matter, with
O(10-100) keV mass, focusing on bosonic candidates such as pseudoscalars and
vectors. We analyze the cosmological abundance, the gamma-background created by
particle decays, the impact on stellar processes due to cooling, and the direct
detection capabilities in order to identify classes of models that pass all the
constraints. In certain models, variants of photoelectric (or axioelectric)
absorption of dark matter in direct-detection experiments can provide a
sensitivity to the superweak couplings to the Standard Model which is superior
to all existing indirect constraints. In all models studied, the annual
modulation of the direct-detection signal is at the currently unobservable
level of O(10^{-5}).
