Here is where they play:
Spelling City: Use their grade level word lists or add your own. Kids can play word games using their spelling list and be quizzed on them later. Free site, love it!
Brain Pop: Not free, but it has loads of stuff on it. Well-made movies on every subject. Quizzes to follow are optional and at several levels. I use Brain Pop, Jr. on a weekly basis with Belle (1st-2nd grade level).
TotLol: This is the Youtube version for kiddos. Love this because it's safe to let my 4 year old Mario obsessed little boy search without fear that he will click on some sicko's homemade video of Mario saying words he should not say. Or shooting things he shouldn't be shooting. Or you get the idea. I'm confused on whether this site is entirely free or not. I have not paid anything though.
Do you let your kids play on the computer? Am I ruining mine?