It depends on what you're looking for, I guess. I've been on the hunt for SPN het because it's not as omnipresent as the Wincest, so that's mostly what I've been reading the past few days. I made a few recs on my poor neglected del.icio.us (http://del.icio.us/carrielh). Also, go through musesfool's SPN fic tag; I found some really good stuff earlier today. And Brynn recced some stuff in my journal, here (http://carrielh.livejournal.com/299815.html?thread=2439463#t2439463).

Wish I could help on the Heroes front, but I've never really looked for fic in that fandom. But I'm sure Lizzen would be very useful in this endeavor!