Check out these cool links for more information on amphibians:
Frogs!
Frog Watch Ontario
NEARCTICA - Explore the Natural World of North America
COSEWIC - Subcommittee for Reptiles and Amphibians
COSEWIC - The Committee on the Status of Endangered Wildlife in Canada
Cool Pics of Frogs and Toads
North American Amphibian Monitoring Program (NAAMP)
Virtual Zoo
University of Michigan's Museum of Zoology