Query Shark -the snarliest, but most helpful agent on the net. You have to exchange niceties for real feedback, which she gives.
Pub Rants Kristin Nelson will always have the honor of being the first agent to reject me. I'd like to think its because I haven't perfected my query letter. She is the agent of Lisa Shearin, a writer I really enjoy. Ms. Nelson is a good agent who has sold a lot of best sellers. At current date she has 88 posts just on query letters.