I started watching CGPGrey yesterday, after my flatmate said I should look at his London v City of London video. It's great. http://www.youtube.com/watch?v=LrObZ_HZZUc
He's done stuff on loads of things too, from science to politics to history http://www.youtube.com/watch?v=OUS9mM8Xbbw&feature=relmfu
I'm sure there are some flaws with it but it's very good at explaining complex shit i find.