These are sites that have fun activities, games, puzzles, etc. Enjoy!
Cool Math 4 Kids - Lattice Multiplication
U.S. Department of Energy
Food Pyramid
Steve Spangler Science
Time 4 Learning
White House for Kids
Interactive Math Dictionary
Read.Write.Think
Our Courts
Time For Kids
National Geographic Explorer
Spelling City
Math Expressions
Puzzle Maker
Tween Tribune
Newseum
Ben's Guide to U.S. Government
Funbrain - Idioms
Study Jams (math and science)
Big Brainz
Kids Know It
History Channel
PBS Kids
Sqool Tools
Egyptian Numbering System