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We present an updated overview on the phenomenology of one-loop Higgs bosonproduction at Linear Colliders within the general Two-Higgs-Doublet Model(2HDM). First we report on the Higgs boson pair production, and associatedHiggs-Z boson production, at O(alpha^3_{ew}) from e+e- collisions. Thesechannels furnish cross-sections in the range of 10-100 fb for Ecm=0.5 TeV andexhibit potentially large radiative corrections (of order 50%), whose origincan be traced back to the genuine enhancement capabilities of the triple Higgsboson self-interactions. Next we consider the loop-induced production of asingle Higgs boson from direct gamma-gamma scattering. We single out sizabledepartures from the corresponding rates in the Standard Model, which are againcorrelated to trademark dynamical features of the 2HDM -- namely the balance ofthe non-standard Higgs/gauge, Higgs/fermion and Higgs self-interactions leadingto sizable (destructive) interference effects. This pattern of quantum effectsis unmatched in the MSSM, and could hence provide distinctive footprints ofnon-supersymmetric Higgs boson physics. Both calculations are revisited withina common, brought-to-date framework and include, in particular, the moststringent bounds from unitarity and flavor physics.

One-loop Higgs boson production at the Linear Collider within the general two-Higgs-doublet model: e+e- versus gamma-gamma