Learn more: http://www.khanacademy.org/video?v=eoJGBr-tJXo
Using Green's Theorem to establish a two dimensional version of the Divergence Theorem

Length: 9 minutes

Conceptual clarification for 2-D Divergence Theorem

Length: 12 minutes

Surface Integral Example Part 2 - Calculating the Surface Differential

Length: 11 minutes

Surface Integral Example Part 1 - Parameterizing the Unit Sphere