The BBC are currently running a pilot project where about 100 video clips are released to the public for non-commercial use.
Some might be useful as stock footage for any videos we make. See: http://www.bbc.co.uk/calc/radio1/content.shtml
The pilot will finish in summer 2006. If all the BBC's stakeholders buy into the idea, it may grow to be a much larger, and useful collection - perhaps even including entire TV programmes for download.