Fanfiction is the most prolific fan material around here (that I'm aware of). I only like a couple pairings, and even then I go for stuff that's pretty vanilla -- but otherwise prefer gen, case!fic sort of things myself. I can probably help find that sort of thing if you're ever interested.

The only discussions I've seen of any depth were around Stargate and Supernatural. I don't find much about other shows, although to be fair I don't search too hard.

Re: Mercy Thompson - I should find out where I left off then, and catch up. :)