American Birding Association: Young Birders: News of competitions and conferences with articles for beginners.
Birding: An introduction to the hobby including strategies, equipment and slang.
Cornell Lab of Ornithology: All About Birds: Provides a wide range of resources on attracting and studying birds. Includes details of how to participate in research projects.
RSPB Kids: Games, activities and factsheets including bird spotting and feeding.
The Fledgling Corner - Birding Family Fun: Offers suggestions for backyard bird watchers. Also includes crafts and jokes. From About.com.