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I’ve been extremely impressed with the quality and value of the videos since I discovered the site a few years ago. And it was no surprise when Bill Gates called Sal Khan his favorite teacher.
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In keeping with the spirit of the Khan Academy’s open source development ethos, I am making this project open source as well on GitHub: https://github.com/joelmartinez/Khan-Academy-for-Windows-Phone
I plan on maturing the app over time with better styling, and more features, especially as I learn more about the silverlight/phone platform. The project is almost ready to submit to the marketplace, just need to complete a bit more testing … so keep an eye on this space for more info about when that happens.