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References for myself and others
Nathan Bransford is, in fact, a literary agent and he goes through all the reasons why he liked the query letter and what made it stick for him. It was immensely helpful to me.
Also a good guide with a sample query letter in it with an agent explaining what made it a good query letter. Other FAQs besides the query letter were useful, and it's always nice to have the actual agent explaining why things work the way they do.
Searchable database of agents. Doubly helpful because it searches by genre, so you can weed out all the people who have no interest in your particular genre.
Be careful, though! Warning! Lots of agents seem to list everything but the kitchen sink. For example, some will *list* sci-fi/fantasy, but when you go to their website all they've sold are spy novels, westerns, and historical romances.
All important for checking the creds on any agent you might be interested in submitting to. I'm generally told that while nothing a being member doesn't make an agent bad, the AAR does some serious QC, so having an agent who's a member is a GOOD THING^TM.