Ivy's Search Engine Resources for Kids: Kid-Friendly Search Engines and Web Guides http://www.ivyjoy.com/rayne/kidssearch.html
Scholastic Kids: Book-Related Activities for Kids http://www.scholastic.com/kids/
Book Adventure is sponsored by Sylvan Learning Center. It's a free online program that lets kids search for book suggestions, take an online "Quiz" over books read, play games, find other websites, and link to almanacs, dictionaries, etc. http://www.bookadventure.org