Just for Kids

Television

Nickelodeon - Nick-Nick-Nick, Nick, Nick-Nick, Nickelodeon!
Nickelodeon, Jr - For parents and their preschoolers
Disney Channel
Cartoon Network - Cartoon cartoon!
PBS Kids
Nickelodeon's Noggin - It's like preschool on TV
Discovery Kids

Toys

Neopets - The greatest Virtual Pet Site on the Internet
Everything Girl - Barbie, Pixel Chix, My Scene, Polly Pocket, and more
Lego
Webkinz - A virtual world for your Webkinz pushie

Kids Magazines

Sports Illustrated for Kids - The SI Kids Magazine Website
Zoobooks - For kids who love animals
Kid's National Geographic

Educational

Mensa for Kids - Games, Activities, & Puzzles
KBears - Knowledge Bears
Coloring-page.com - Free printable coloring pages, online games and coloring activities
Coolmath - Sharpen math skills and play math games
NLVM - Online manipulatives for pre-K through 12
Kid's Space - Where kids can write their own stories and music

Site Lists

Kids.gov - Multiple lists of links deemed safe for kids
Woodlands Junior School - Another list of cool links for kids