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We update our previous results by increasing the luminosity, the efficiency,and for the Ds+ the number of tags. We determine f{D+}=(205.8 +/- 8.5 +/- 2.5)MeV, and an interim preliminary value of f{Ds+}=(267.9 +/- 8.2 +/- 3.9) MeV,where both results are radiatively corrected. We agree with the recent mostprecise unquenched Lattice-QCD calculation for the D+, but are in disagreementfor the Ds+. Several consequences are discussed, including the possibility ofphysics beyond the Standard Model.

The Purely Leptonic Decays D+ -> mu+ nu and Ds+-> lepton+ nu at CLEO