The key differentiator is that these are aimed at under-grad and grad students and are simple conversion of what happens in a course, where the internet is only incidental.
Khan Academy videos are aimed primarily at school students and are much shorter, more focused and completely based on the internet. The tests are geared for online testing, the metrics collected are then displayed online etc.
Just to prevent readers from taking that statement literally, only a small minority of courses offer all these materials. (e.g., see [1]--you can see by the icons on the left which materials are available for which courses.) Most only offer lecture notes, and even those are generally very incomplete.
What MIT has done with OCW is outstanding, and I personally have learned a lot from many courses already, but they still have quite a ways to go to meet such a comprehensive claim. More funding and enthusiasm for the effort is still very much needed.