General amphibian links:

Amphibian Species of the World - AMNH
Amphibians of Central Europe
Amphibians of Canada
Checklist of NA Amphibian Species and identification guide
Connecticut Amphibians
Amphibiaweb
Amphibian care
Amphibian Embryology Tutorial
Mark Staniszewski's Amphibian Information Centre
Introduction to the Amphibia
Living Amphibians - Tree of Life Project
LivingUnderworld: Amphibian Information Resource

Amphibian declines and related links:

FrogWeb: Amphibian Declines and Malformations
Declining Amphibian Population Task Force
Amphibian Diseases Home Page
Global Amphibian Assessment
USGS Amphibian Research
Amphibian Conservation Alliance