Video:

Have some customer case studies? Interviews with your CEO? Recorded presentations from your last conference? Post them to video sharing sites:

1.) YouTube - If your video is under 10 minutes (and the shorter the better), YouTube is the best site for sharing your videos. Key sharing features: tagging, social media share links, video embedding, subscriptions

2.) Blip.tv - If your video is more than 10 minutes, use a site like blip.tv (or Vimeo or Viddler) to post your videos. Key sharing features: tagging, automatic iTunes (and other video) syndication, creative commons licensing, video embedding, subscriptions

Or, use a tool like Visible Measures to post and track your videos across many video sites.