University of California
Ucmp: Photosynthetic Pigments
The University of California provides an overview of photosynthetic pigments includes definition, importance in photosynthesis, and description of 3 basic classes of pigments.
Other
Southeastern Louisiana University: Photosynthesis
Excellent site outlines various aspects of photosynthesis, including light properties, pigments, and process. Graphics include absorption spectra for pigments and action spectrum of photosynthesis.