  We study minimal scenarios of resonant leptogenesis near the electroweak
phase transition. These models offer a number of testable phenomenological
signatures for low-energy experiments and future high-energy colliders. Our
study extends previous analyses of the relevant network of Boltzmann equations,
consistently taking into account effects from out of equilibrium sphalerons and
single lepton flavours. We show that the effects from single lepton flavours
become very important in variants of resonant leptogenesis, where the observed
baryon asymmetry in the Universe is created by lepton-to-baryon conversion of
an individual lepton number, for example that of the tau lepton. The
predictions of such resonant tau-leptogenesis models for the final baryon
asymmetry are almost independent of the initial lepton-number and heavy
neutrino abundances. These models accommodate the current neutrino data and
have a number of testable phenomenological implications. They contain
electroweak-scale heavy Majorana neutrinos with appreciable couplings to
electrons and muons, which can be probed at future e+ e- and mu+ mu-
high-energy colliders. In particular, resonant tau-leptogenesis models predict
sizeable 0\nu\beta\beta decay, as well as e- and mu-number-violating processes,
such as mu -> e gamma and mu -> e conversion in nuclei, with rates that are
within reach of the experiments proposed by the MEG and MECO collaborations.
