I've been researching the most effective ways to write a query letter. I thought I'd share with you the posts that caught my attention. In no particular order:
101 Things in Queries That Catch My Eye (Or At Least As Many As I Can Think Of)
How do I format emailed pages in a query?
How to Query an Agent
How to write a query letter
Writing A Simple, Compelling Query
Query Letter Mad Lib
Query Shark - A blog devoted to queries
Pitch Parlour - A UK blog largely devoted to queries
Check out the links on my side bar. Many agents offer query advice on their blogs.
Do you have other posts about queries to recommend? Please post them in comments!