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New arguments are presented in favor of the infrared finite coupling approachto power corrections in the context of Sudakov resummation. The more regularinfrared behavior of some peculiar combinations of Sudakov anomalousdimensions, free of Landau singularities at large Nf, is pointed out. A generalconflict between the infrared finite coupling and infrared renormalonapproaches to power corrections is explained, and a possible resolution isproposed, which makes use of the arbitrariness of the choice of constant termsin the Sudakov exponent. A simple ansatz for a `universal' non-perturbativeSudakov effective coupling at large Nf emerges naturally from theseconsiderations. An alternative evidence for an infrared finite {\emperturbative} effective coupling in the Drell-Yan process at large Nf (albeitat odds with the infrared renormalon argument) is found within the framework ofSudakov resummation for eikonal cross sections of Laenen, Sterman andVogelsang.Comment: 5 pages; version 2: one sentence and one equation added (to appear in  the Proceedings of the FRIF Workshop on First Principles Non-Perturbative QCD  of Hadron Jets (Paris, 12-14 January 2006); version 3: additional material,  comments and references (to appear in Physical Review D (Rapid  Communication)

Evidence for infrared-finite coupling in Sudakov resummation