The Xerces Society for Invertebrate Conservation is an international nonprofit organization that protects the natural world through the conservation of invertebrates and their habitats. Their website provides a large number of resources on pesticide reduction and pollinator conservation.
The Bee Conservancy provides a large amount of information on creating and conserving bee habitat
Monarch Watch is a conservation and research program based out of Kansas. They provide educational resources on monarchs, a database of weigh stations, and monarch migration tracking.