http://www.sixtysymbols.com is really great.
There's also the Mechanical Universe...documentaries.
And there's more and more stuff all the time. If you type someone like Feynman into google, you'll find lots of stuff on him...And if you listen for the names mentioned - then you Youtube those names and you find more stuff - some stuff is just a few minutes long, some stuff longer. Even if you don't really understand what they're on about, you watch the different videos and you'll start to build up a picture.
Any videos where someone is on about cosmic consciousness or thought being energy that can neither created nor destroyed, or that you can influence the universe with the power of your mind - those are not science videos - but they out number genuine science videos on the internet 10 to 1.