National Geographic Kids

Features different people, animals, and places each month with facts, games, activities, and related links.
http://www.nationalgeographic.com/world/

IKidZ

Magazine for kids from India now living in the U.S. Includes stories, puzzles, jokes, riddles and works submitted by kids.
http://ikidz_mag.tripod.com

Smithsonian Magazine Kids' Castle

Educational ezine with articles, photos, interactive message boards and games.
http://www.kidscastle.si.edu/