  The BaBar Collaboration has an intensive program studying the cross sections
of hadron production in low-energy e+e- annihilation, accessible via
initial-state radiation. Our measurements allow a significant improvement in
the precision of the predicted value of the muon anomalous magnetic moment.
These improvements are necessary for shedding light on the current > 3 sigma
difference between the predicted and the experimental values. We have published
results on a number of processes with two to six hadrons in the final state,
and other final states are currently under investigation. We report here on the
most recent results obtained by analysing the entire Babar dataset.
