Links
BUGZ
California Dragonflies and DamselfliesTHE author on dragonflies in California. Book for purchase, but free downloadable key for field identification. Main site has excellent guides and resources for buidling ponds for wildlife.
Xerces Society Bumblebee IdentificationBumblebee identification HARD. Xerces society is a leader in invertebrate conservation, and has plenty of other great recourses outside of bumblebees as well.
SCIENCE, KNOWLEDGE, OTHERWISE
BHL LibraryBHL Library (Flickr) iNaturalist
Citizen Science and identification tools for everyone!