This is an interesting article about fan fiction, not so much because of all the introductory stuff ("...and that's why it's called slash!") but because of the stuff at the end about how much literature (including everything Shakespeare ever wrote, not just Hamlet and King Lear) is swiped either from other literature or from historical events. (Plus the article quotes Anne Rice being hysterical. I think it's incredibly funny that she takes herself so seriously. She writes vampire porn, badly, yet in her mind she's Marcel Proust.)
Anyway, once upon a time I did write a Firefly fanfic. I knew I'd never sell it, so I didn't bother to polish it, but if you want to read it anyway, it's here.