The Royal Institution's New Video Collection - Science, Maths, Nature, Engineering, Space, Environment etc!

This looks like a great showcase of science vids! For a start:

The RI Channel 

Oh, and of course, they have all their Christmas Lectures too. 

Here's an example:

The creator, Matthias Wandel, has a website too --> http://woodgears.ca/ (An Engineer's Approach to Woodworking)