sartorias, purveyor of fine discussion, has an interesting article on fanfiction and metafiction at Bookview Cafe and further comments on her journal
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And I don't think it's as easy as 'I write metafiction, you write in dialogue with someone else's text, he writes fanfiction'.

( A question of dialogue? )

Apologies for not linking to various fanfiction articles that have sprung up all over the net recently; I've read a fair few of them, but I did not take notes.

As far as I see it, there are a number of issues that get conflated; I'd like to address them one by one.

These are my characters. I don't want anybody else to play with them

( The writer's right )