Gamequarium.com:  The site that swims with learning fun! Kid Explorers
PrimaryGames.com Softschools.com -
Free math and phonics worksheets and online activities.
Starfall Learn to Read Christ Centered Mall--full of games and activities
Puzzles and Mazes
Teddy Bear Jigsaw Puzzle
Jigsaw Puzzles

Chuzzle--we use it to teach our children their colors and also to match 3 or more colors at once