  We discuss recent results for the asymptotic behavior of fermion scattering
amplitudes in the Sudakov limit. The results include next-to-next-to-leading
logarithmic electroweak corrections and are used for the analysis of
fermion-antifermion pair production in e+e- annihilation at high energy. The
importance of the subleading logarithmic contributions is emphasized and the
fermionic contributions to the Abelian form factor at two loops are discussed.
