Below is the trailer for another Sundance Film Festival 2009 entry titled, Nollywood Babylon, a feature documentary about the explosive popularity of Nigeria's movie industry, aka Nollywood, the third largest in the world, behind Hollywood and Bollywood.
This is the second documentary on Nollywood that I am aware of. The first, Welcome To Nollywood, failed to make much of a splash, however is available for sale on DVD via the National Black Programming Consortium.
I hear Nollywood Babylon is better, thorough, and delves much deeper beneath the surface of it all. I hope I get to see it eventually.
Here's the trailer: