Flight of the Hamsters – Warning! Totally addictive and a mega time waster. Also, tons of fun.
Spellingcity.com – makes practicing spelling words fun!
Sheppard Software – terrible name, but full of fun, educational games for kids.
MSSS Crafts and Resources for Bible Stories – although originally designed for “Sunday Schools,” this is a great resource for any family wanting fun ways to teach their kids about the Bible.
The Learning Calendar – awesome history based activity/trivia calendar (online version). Love it!