Quick post in order to furnish y'all with a new website I've found.
Not, as far as I can tell, affiliated with the KIDLIT-L listserv (which by the way, can someone out there in BloggerLand tell me what the correct address is for that? I've been trying to subscribe for weeks, without success). This website was started by a mom looking for books for her kids. It features a database, which you can search by all sorts of different criteria, like the reader's age, gender, or reading level, and genre, keywords, and even ethnicity of the book's characters. Pretty handy. Plus you can look up particular books to see what real kids think of it, and whether you agree.
The database does not include picture books and concentrates mostly on chapter books for readers between 6-12 years. It does include YA books, but under the lump heading of "12+". Still, it's well worth putting on your favorites list, if you ask me.