Here is an ongoing list of great websites for different purposes...
Researching Animals
National Geographic for Kids
National Geographic
Animal Planet
World Wildlife Federation (Endangered Species)
San Diego Zoo
Asian Trail (Animals in Asia)
Sea World
Oregon Zoo
The Smithsonian
Glossopedia
Math Practice and Games
Who Wants to be a Mathionaire
Scholastic (Study Jams)
Math Makes Sense
Alien Addition
Brain Teasers
E-Lab
Arcademic Games
Math Playground
Math Brain
Living Mathematics
Typing Practice and Games
Typing Master
Typer Shark
Spider Typer
Frog Game
Power Typing
Learn to Type
Word Games
Free Rice
Brain Games
My Favorite Web Tools
Wordle
Memoov
Prezi
Glogster
Zooburst
Write Comics
Animoto
My Favorite Sites
The Story of Stuff