The home page of Sharon Kinsella offers full-text academic papers of interest to researchers in Japanese popular culture and girlhood. Some articles have free full text available.
Kiddie Records is a unique website devoted to scanning and restoring the picture covers of children's recordings from 'the golden age' (1940s and 50s), and accompanying these with the actual music or stories contained on the discs.
Includes a useful bibliography, titled 'Fan fiction: a bibliography of critical works', has about 50 hyperlinks embedded in it, leading to full-text copies of the items listed.