educational apps on ipod touch/iphone

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fave educational app for my kids is " Flash Tables " for helping them learn their multiplication tables. Fantastic value for money and my 7 year old is now rising about the other children at school with her tables. hooray! Check it out here www.touch.frogameleon.com/education/FlashTables/ Or search itunes for " Flash Tables " What are your favourite educational apps and do you think they are good enough to warrant getting children their own Ipod touch? I think a lot of the apps are fantastic and ipod touch for me is better than nintendo ds for my daugher.