I'm halfway through a lecture by professor Brian Cox in Hull. He's really good, he explains everything easy enough that even a monkey like me can understand.

Edit: It was brilliant! If any of you guys get a chance to see the show in your city I highly recommend it. He touched on a little bit of everything you need to understand a black hole. He explained Einsteins theory of relativity, black hole and event horizon and singularity. He explained white holes which giives the theory of wormholes, then he explained how a spinning black hole makes time travel theoretically possible through multiverse and it's all proven by maths. He does a bit on quantum entanglement too, I'm probably forgetting half of it, the ways maths predicts wormholes etc, and he does it all with a ginormous screen showing images. I thought I understood the basics after watching TV/YouTube but this is broken down in such a way that anybody can understand easily.