The otherkin timeline is a good summary of the history of the otherkin community, as is the fictionkin history page. Some of these links are more about the community itself, some are more for help with identity and the otherkin self.

On "Kinning for Fun"

The accepted definition of otherkin is "a person that identifies wholly or partially as nonhuman or as a fictional entity, on a nonphysical, involuntary, and profound level".

otherkin timeline
fictionkin history
'kin writings directory
alterhuman definitions
'kin definitions
otherkin sources
otherkin faq
elven love letters
were library
"kin to the other" essay
psych kin
memories i
memories ii
"about us as" essay
angelkin glossary
angel info
dict. of angels