  We reconsider the possibility that inflation was driven by a sneutrino - the
scalar supersymmetric partner of a heavy singlet neutrino - in the minimal
seesaw model of neutrino masses. We show that this model is consistent with
data on the cosmic microwave background (CMB), including those from the WMAP
satellite. We derive and implement the CMB constraints on sneutrino properties,
calculate reheating and the cosmological baryon asymmetry arising via direct
leptogenesis from sneutrino decays following sneutrino inflation, and relate
them to light neutrino masses. We show that this scenario is compatible with a
low reheating temperature that avoids the gravitino problem, and calculate its
predictions for flavour-violating decays of charged leptons. We find that $\mu
\to e \gamma$ should occur close to the present experimental upper limits, as
might also $\tau \to \mu \gamma$.
