Hi Guys,
I just wanted to draw your attention to www.videvo.net - after making a free account you have unlimited access to thousands of free HD stock footage and motion graphics clips.
This will be of particular interest to student filmmakers and anyone on a zero budget who wants to enhance their output. I've been working here for a few years now and have had great fun shooting stock! Here's an article I wrote about our trip over London in a helicopter: http://www.videvo.net/blog/aerial-stock-shooting-over-london/
Enjoy!