General
lightgetsin - Professional authors on fanfiction - My immediate response, fresh off the Tiptree debacle, is that pro authors shouldn’t be asked because they’re not part of the community or the intended audience of fanfiction , so their judgments use an inappropriate frame of reference.

Fandom-Specific ( Cut for possible spoilers in Supernatural, Harry Potter and Doctor Who fandoms. )

On Creating and Criticism
foreverdirt - Narrative voice in book-fic - The thing about writing pastiches of written work is you have to use the same narrative style as the text.

hedda62 - really ought to have a clever quote or allusion here... - I thought I'd look at how I have and do approach the matter of inspiration, allusion and quoting (my approach to plagiarism is "don't do it" but, apparently, one person's plagiarism is not another's).

painless_j - The art of storytelling and the work of storytelling - That's why most stories need work. When you are seized by your Muse, you don't see your story as the readers will.