Hmm... depends on what I'm doing...
I actually use Wikipedia to become an instant 'expert' in almost anything related to pop culture. Or to make sure that I'm referring to something that's outside my certainty properly.
For Stargate stories, I always go to http://www.gateworld.net -- between the Omnipedia and the episode transcripts, it usually covers what I'm looking for
For Harry Potter stories, I try to use the Harry Potter Lexicon (http://www.hp-lexicon.org)... it was 'updated' a couple of years ago and I think it's less helpful as a result... but it gives me enough to do what I need.
And then, Google is my friend!
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