Much like the Khan Academy videos (but shorter), Brightstorm.com provides lecture-style video clips of science topics being explained at a whiteboard. Science is categorized into: biology, physics, and chemistry. Suitable for high school use.
I would also recommend checking out some clips from Veritasium and comparing them to Brightstorm. How could clips from these two very different providers be used together to support student learning of BIG IDEAS in science?
I can imagine videos such as these being used in instructionally powerful and less powerful ways. I would love to hear how you would (or have) used such lecture-based instructional videos.
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Science for All 