There are a number of web sites which host a range of film clips and movie trailers. I especially enjoy the trailers and short animations found at www.pixar.com

For old television clips try the TV ARK pages. It used to be possible to view old adverts here too, lets hope it isn’t too long before they are back online :-).
Other collections worth a look include Screen Online and Film Education which both include lesson ideas and teacher’s notes for use with film. Alternatively www.arkive.com offers a glimpse of life on Earth.
Our friends in the Bristol ICT Team have started to collect together a range of film clips which they are generously sharing at:
http://whiteboard.bristol-cyps.org.uk/vis_lit2/
Images of film clips can be captured into Interactive Whiteboard flip charts by pausing the clip and using the software’s camera tool.