Video Copilot has a free download of 100MB of stock elements for Free Stock-Pack Appreciation Day:
"This random collection of 20 stock elements and textures range from a night at the Air Show, to a burning Fuse and some stunning Time-Lapse clouds. Not to mention a little payback! Well… actually, video clips of money from around the world."
Just a token, but it comes with less apprehension than those mysterious free stock DVDs everyone has been offering.
Update: Weynand Training shares notice of a 7-Day Free Trial to VideoBlocks.com, for download of 20 clips a day during with access to over 30,000 video clips, backgrounds, effects, etc.
And of course Artbeats has free clips, currently new weekly.