If you haven't read it already, look for Angela Carstensen's article in the Spring 2010 issue of YALS, "YALSA Award for Excellence in Nonfiction for Young Adults, Year One. " The 3-page feature starts on page 38. Carstensen was the chair of the new award committee, and she presents an enlightening inside view of the process that went into the selection of the 2010 nominations, finalists, and winners.
The committee wrangled with issues like whether to include poetry and books published for the 10-12 age range, readability and accessibility versus appeal, and how to judge books that don't rely on research. Carstensen ends the article by encouraging field nominations. The link to the page where you can nominate a title is: http://yalsa.ala.org/forms/nonfiction.php.