Amphibian Declines in Australia
http://www.jcu.edu.au/school/tbiol/zoology/herp/decline/decl.shtml
A site hosted at James Cook University in Australia, documenting amphibian declines there, particularly in Queensland. Unfortunately it does not appear to have been updated for some time.
Applied Ecology Research Group: Herpetology
http://aerg.canberra.edu.au/pub/aerg/herps/
Another Australian site, with information on conservation projects, herpetology events in Australia, photo galleries, etc.
Declining Amphibian Populations Task Force (DAPTF)
http://www.open.ac.uk/daptf/
An international network of researchers operating under the auspices of the IUCN's Species Survival Commission. Includes an archive of their excellent newsletter, FROGLOG. Probably the best single web destination for an overview of the amphibian situation.
North American Amphibian Monitoring Program (NAAMP)
http://www.pwrc.usgs.gov/naamp/
The North American component of the DAPTF. Information for researchers, teachers, families and the general public, including how you can participate in various studies of amphibian populations, by listening for frog calls, counting salamanders, and so on.
Turtle Trax: A Sea Turtle Page
http://www.turtles.org/
Information on sea turtles, particularly their conservation status. The focus is one one group of sea turtles in Hawaii, but there is also information on sea turtles in general - and why all species of them are either threatened or endangered.