Can you suggest a website for choosing appropriate fantasy books for children?

Answer 1

Try this website maybe:
http://www.biblio.com/search.php?stage=1&catalog=1147

Or maybe:http://www.npr.org/templates/story/story.php?storyId=4646599

or:
http://www.amazon.com/s?ie=UTF8&index=books&field-keywords=Children's+9-12+-+Fiction+-+Fantasy&page=1

or maybe even this one:
http://www.powells.com/psection/Childrens.html

Don't know if any of those are what you're looking for, but you might at least get some titles or authors of childrens fantasy books off of them.

Answer 2

I would think just going to Amazon.com would help. There are usually reviews by readers that will tell you if a book is appropriate or not.