This website is useful for fanfic writers in that it is a site where beta readers congregate--all an author must do is contact one of the betas from this site in order to proof a fanfic.
This article might prove useful to those working on Fan Fiction. The beta readers are useful for another set of eyes on a particular work, though they are not always used. FanFiction.net does have betas for authors to contact, but does not automatically provide them. If they did, the quality of the site might be improved.
I kept thinking of WIkipedia during the discussion about online anonymity and the idea that "anyone" can edit a page. This article gives information about the Reliability and Quality of sources and information, though also linking to pages where a person can find the style guide to keep wikipedia articles looking the same.
I thought this website gave a good overview of how to write a fanfiction. Though it focuses mainly on Sailor Moon fanfics, it give a good explanation of what fanfiction entails.
I spend a lot of time here, and would like to touch upon fanfic in my project. I'm looking to see if they have a specific disclaimer for the site. Individual authors cite the original author/s at the beginning/end of the new work.