Channel 9 is a video service run by Microsoft. Channel 9 provides a way to embed videos but is not yet on the WordPress embeds core list. This plugin allows you to simply paste a URL to a Channel 9 video as you would with any other embed service into your post. The video from Channel 9 will show at that location.
Channel 9 can be found at http://channel9.msdn.com
This plugin is available for download to be used on your WordPress self-hosted installation.