One of my frequent haunts as an aspiring author is Guide To Literary Agents Blog. You should definitely check it out, especially if you are a YA writer like me.
Right now there is a Dear Lucky Agent contest going on for YA writers. Basically, you send in your first 150-200 words of a polished, unpublished novel to be judged by an agent and if you win, you get a 10 page critique! Sounds awesome, right? Head over there and take a look. I just entered!
Let me know if you did too!