This is an excellent idea, and you have avoided many pitfalls (and legal implications) by not actually hosting the files.
You may be interested that the site below give awayatleast 3 HD stock video and animation clips each month. These are royalty free for any purpose.
http://www.wavebreakmedia.com/stock-video-footage-i-15/Free-HD-Stock-Video-and-3d-Animation-Downloads.html
I’m not sure how these would link in with your site as they change each month,and a user needs to download from the site. Have you considered also having a resource page with external links to such pages as this? You might even be able to link in with the RSS feeds that some sites provide.
The opendv projectcould evolve into an excellent resource and greatly needed. Bestof luck, I will keep an eye on it !
