If you are a writer seeking an agent AND participating in the Month of Letters Challenge, let me tell you about a neat thing. My agent, Jennifer Jackson, is offering to respond with letter to one randomly chosen query letter per business day. That’s right. A  personal response, mailed back with feedback on either the query itself or the concept of the novel.
In support of this endeavour, I am offering a special query letter #LetterMo. Due to the nature of this proposal, the kind and beneficent Mary Robinette Kowal has given me a variance on rule #2 (see official site here and sign up to participate in the challenge). I will only be responding to the queries received once and not engaging in additional correspondence (unless, of course, I request your manuscript).
For full details, go over to The Month of Letters Challenge | Et in arcaedia, ego. And for heaven’s sake, read the guidelines.