@Guns4Hire: You're welcome. Though the non-HP fan fiction
is limited, it's still there.
@Amalthia: I don't know the particulars on how those particular sites implement the EPUB feature, but I do know there is a PHP class (
found here) that can generate an EPUB file. You'll have to know some object orientation and PHP basics if you want to use it successfully though. I suspect it shouldn't be that difficult to implement in eFiction (which is the engine your site runs on, right?). If you'd like help doing that, I'm offering.