Best educational apps for kids

Someone recommended Math Ninja to me recently, and we tried it yesterday. My oldest LOVES it. As in, was shouting "Yeah!" in the middle of his math practice, and telling me twice he loves it. (Strangely, this is not a frequent reaction to math practic in my home.) So I did a little research today; hopefully it will be helpful for all you techies out there.

Here are some lists of the top apps.

http://imaginationsoup.net/2011/04/10-best-educational-ipad-apps-for-elementary-kids/

http://www.eschoolnews.com/2011/01/07/10-of-the-best-apps-for-education/

http://www.appannie.com/top/ipad/united-states/education/

http://sonoma.patch.com/articles/teaching-technology-the-ipads-best-educational-apps

http://www.appolicious.com/education/articles/9492-top-20-must-have-educational-iphone-ipad-apps-used-by-real-teachers-in-the-classroom

 These are solely devoted to educational apps for kids.

http://www.funeducationalapps.com/

http://www.bestkidsapps.com/ages-0-4/the-best-educational-iphone-apps-for-kids/

May they lead to a few more shouts during your math (or whatever) practice. Help us out: What educational apps do your kids love?