Designing a Mobile App? Don't Make These 10 Mistakes — mashable.com — Readability http://www.readability.com/articles/1jq73z1x
Khan Academy: Free education in app form http://content.usatoday.com/communities/technologylive/post/2012/03/khan-academy-free-education-in-app-form/1#.T4RBzZrLwUX