Contests have a way of motivating me to clean up my one-line pitch, query, and first page of my novel. Here is a contest from the Guide to Literary Agent blog:
The first 150-200 words of your unpublished, book-length work of young adult fiction. You must include a contact e-mail address with your entry and use your real name. Also, submit the title of the work and a logline (one-sentence description of the work) with your entry.
One of my writing partners just signed with an agent due to this kind of contest. Read an interview with a very talented, very deserving, Nancy Herman.
Good Luck on the GLA contest!