There's a forum for that, Query Letter Hell

(password vista)

You have to have at least 50 posts to begin a thread asking for crits, but in the meantime, you can spend time in there reading the stickies & other people's query threads, and critting other queries (which is a great way to learn about current expectations in query letters, if you're new to this & if you aren't new, it's still a great way to become an active member in the community).

Good luck!