And then the iPad and iPhone apps were released. I was euphoric. So I downloaded it to my iPad.
As did a reviewer Lisa Caplan: http://www.appolicious.com/education/articles/11373-the-khan-academy-goes-mobile-with-new-ipad-app.
Compare with The Wasteland app, for T.S. Eliot's great poem: http://www.touchpress.com/titles/thewasteland/ The Khan Academy would benefit from the tips feature in this app. Validating that is this blogger's observation: http://ipadinsight.com/ipad-app-reviews/quick-look-the-waste-land-for-ipad. What I also love about this app is all elements are contained within so you don't need to be online once you've downloaded the app to your device.
http://www.appsafari.com/books/15576/the-history-of-jazz-an-interactive-timeline/.
But back to Khan Academy iPad App. Future iterations could incorporate some tips from the apps above. I found it difficult to find the exercises and videos -- they were available as small links in my profile. Not all parts of the app are populated with content, and while it gave me "energy points," with no orientation, I am not clear on what the points indicate. Additionally, the points for watching a video were not tracked, though I did watch more than one. So here's to future iterations--with Smarthistory added to Khan, it will be great to have these impressive resources available on a variety of devices.