Regents of the University of Michigan
Animal Diversity Web: Introduction to Teeth
The Animal Diversity Web offers a very good description of teeth in the digestive process of mammals. Covers the variety of teeth and links to discussions on a variety of teeth issues.
University of California
Ucmp: Eutheria
UC Berkeley offers a very general description of the generalized diet of mammals. This means it describes the fact that there is an enormous variety of diets.