Awesome, what a great combo.
For those unfamiliar with Vi's work, she makes very entertaining and accessible video series called "Doodling in Math Class". Here's one of my favorites, called "Infinity Elephants"
http://bit.ly/zEiugp
In hindsight, it looks suspiciously like the practical problem-solving part of an interview.
Vi seems like a well-rounded addition to Khan Academy: She makes videos and also does great hands-on educational inspiration with her artist-in-residence stints and all (update: http://vihart.com/blog/tags/Harvard.html).
Sal Khan wants to run a real school, and Vi will be a world-class camp counselor.
Good thing to do. Khan does great work, but to be true, he is quite boring sometimes. Getting somebody else in with better grasp of how to make a video educational and entertaining at the same time would be a great idea.
Well i've never heard of Vi Hart but she seems to do a similar sort of thing to Sal making educational videos, so it seems like a natural partnership. The Khan Academy seems to be going from strength to strength. :)
Also be sure to check out her hobby of building musical instruments out of paper and then playing them while they are on fire.