This is a free download of an ebook by Noah Lukeman, How to Write a Great Query Letter: Inside Tips & Techniques for Success. Hope it's helpful to someone! The download link is near the bottom of the page. :)
http://www.lukeman.com/greatquery/
This is GREAT! Downloading this to my nook! I was searching tonight for a good reference on Amazon then stumbled across this post. Free is in my price range!