Henry Jenkins, Textual Poachers: Television Fans & Participatory Culture. New York: Routledge, 1992.
My rating: ****
This is the seminal foundational text in terms of academic studies of fandom. Even if it was published in 1992 before the explosion of internet fandom and a more mainstream (even if still grudging) recognition of fan practices, it is still chock full of useful and current ideas.
This well written and highly readable book has done a great service in single handedly promoting the possibility of academic fan studies an invitation which has been taken up by numbers of others since.