There are few other world changing endeavors that can match the scalability of impact of the Khan Academy.

Haven't encountered it, but would be great to see translations done on a larger scale to touch the wider world.

Additionally, perhaps at a later date, would be interesting to see the same topics covered by additional instructors (and rated) available on the site to provide variation in teaching styles.

Nevertheless, even today, this is the best thing going on in the education field. Kudos to Sal.