crack_van is my go-to for Merlin recs at the moment. A vast majority of the recs there are pre-S2 (or canon-indifferent) fics, and the few that aren't are marked as such as easily avoidable. (I put off watching the second series for a while, and had no problem finding plenty of fic in the meantime.)
The only downside is that it tends to lean heavily toward Arthur/Merlin, but that's reflective of the fandom as a whole. And isn't really a downside (I'm exceedingly OTEVERYONE in this fandom, so), except for when you're trying to branch out a bit.
such_heights also has many recs on her journal, and mostly Gwen&Morgana-centric; check her tags.
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The only downside is that it tends to lean heavily toward Arthur/Merlin, but that's reflective of the fandom as a whole. And isn't really a downside (I'm exceedingly OTEVERYONE in this fandom, so), except for when you're trying to branch out a bit.