Thanks to bogstandardcomp from the TES Forums for this one.
PBS have a series on their archives called Scientific American Frontiers. Although the last episode posted there was a couple of years ago, they have full episodes online and allow easy navigation within clips. There are also teaching resources and notes to go along with each one.
For some highlights have a look at:
– Make Up Your Mind (brain development and neuroscience)
– Hot Planet, Cold Comfort (climate change)
– Going Deep (ALVIN and deep-sea exploration)
– The Gene Hunters (Genetics and a few good resources)