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The idea of quark-hadron duality is developed and applied to integral sumrules for the photoexcitation of meson resonances. Some applications of thepresented approach in the light and heavy quark sectors are made, and the roleof the scalar diquark cluster degrees of freedom in the radiative formation oflight scalar mesons is discussed.Comment: 7 pages, Latex, no figures; Talk given at the 2nd International  Symposium on the Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the  Nucleon, Genova, Italy, July 3-6, 200

QUARK-HADRON DUALITY IN PHOTOABSORPTION SUM RULES AND TWO PHOTON DECAYS OF MESON RESONANCES