I'm OBSESSED with The Public Query Slushpile. Since I started writing, I've been looking for someone who knows how a query letter is supposed to work, what information needs to go in it, how to format and everything in between. I can't believe it took me so long to find this site and I want to thank Rick Daley for creating this opportunity for me!
If you want a serious critique of your query letter, even some plotting, visit The Public Query Slushpile directly or through my "For Writers" page (listed under Author and Industry Blogs). I have to tell you though...if you post, I will most likely comment on your query. I find myself commenting on every entry, but it's for your own good!
This is an awesome chance to get your query letter ready for submission and all the comments I've received there have only bettered my chances of landing an agent.
Are there blogs, websites, trusted advisers out there that you simple can't help stalking?