I just read a page on the Math Stack Exchange linking pages with videos of Math lectures and would love to have a similar thing for History--hopefully that's an acceptable "question" to ask here. Also audio lectures would probably be good too.
The topic is a little huge, though, so since my current interests are in ancient history I'll restrict this post to resources for ancient history.
I'll provide the ones I already know about.
Everything from Crash Course, which I believe is the same that Khan Academy uses.
A couple classes from Tara Carter at UCSD, hopefully the links hold up: Prehistory and World History