Scholastic (http://www.scholastic.com)

It's so refreshing to go to a site that's organized, thorough, and full of useful information. Scholastic.com does a great job of talking and appealing to such a large age range, from kids pre-K to 18 to teachers and parents. The one downfall of covering too much ground is that users can get a little overwhelmed on where to go first. Scholastic.com's clear navigation will definitely help, although younger kids (and even adults) might be blurry eyed trying to sift though everything. Users will appreciate the fact that even though site still pushes its stuff through ads, contests, and content, most of the stuff they're pushing is books and their beloved characters -- and they're doing it in a way that makes learning fun.