I‘ve been following Kaltura for about a year now. It offers a terrific open-source platform, toolset and nearly free video hosting solution for small and large companies and nonprofits. (I think I have that right — it’s hard to explain what they do in a single sentence.)
From the site: “Kaltura’s goal is to bring interactive video to every site and to create the world’s largest distributed video network.”
Here’s a 9-minute video interview with CEO Ron Yekutiel. They’re about to give users the capability to add video and widgets to Wikipedia, and they’re working with MediaWiki.org as well. They also offer an extension that provides WordPress blogs with video abilities.