  We show that contact homology distinguishes infinitely many tight contact
structures on any orientable, toroidal, irreducible 3-manifold. As a
consequence of the contact homology computations, on a very large class of
toroidal manifolds, all known examples of universally tight contact structures
with nonvanishing torsion satisfy the Weinstein conjecture.
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  On montre que l'homologie de contact distingue une infinite de structures de
contact tendues sur toute variete toroidale irreductible et orientable de
dimension trois. En consequence des calculs d'homologie de contact, sur une
tres large classe de varietes toroidales, tous les exemples de structures de
contact universellement tendues de torsion non nulle connus verifient la
conjecture de Weinstein.
