Animalsheltering.org A program hosted by the Humane Society of the United States, providing resources to assist animal care professionals and volunteers.
Make Mine Chocolate! Dedicated to protecting rabbits at Eastertime, from the Columbus, Ohio House Rabbit Society: provides flyers, handouts, etc. that you can use in your neighborhood.
ASPCA Poison Control Keep this number/web page easily accessible!
ASPCAs Humane Resources Books Lots of great resources and ideas for rescues and shelters.