MIT Opencourseware has a few courses, but they only include lecture notes, no audio/video.  I believe the Khan academy approach would be incredibly useful to me as I begin my Master's with emphasis in writing fluid dynamics codes : - )

Doubt I'm allowed to link here, but the MIT courses that I wish had a Khan-style approach are:
18-330 Introduction to Numerical Analysis, Spring 2012

18-335 Introduction to Numerical Methods, Spring 2019

18-336 Numerical Methods for Partial Differential Equations, Spring 2009

and just for fun

16-13 Aerodynamics of Viscous Fluids, Fall 2003.

Thanks!