  We study the discovery reach of the Tevatron and the LHC for detecting a
Higgs boson (h), predicted in composite models of the electroweak symmetry
breaking or in supersymmetric theories, with an enhanced b-quark Yukawa
coupling via p \bar{p} / p p \to b \bbar h (\to b \bbar) + X. Our analysis
shows that studying this process at the Tevatron Run II or the LHC can provide
strong constraints on these models.
