DeleteCity saves videos from YouTube deletion.
DeleteCity saves videos from being deleted from YouTube caching a bunch of them on your server, then checking back periodically to see if they have been taken down. When it finds videos that have been removed, it posts them on your blog with a link to the author's YouTube page. You can tell DeleteCity to use YouTube feeds by keyword to customize which videos you try to save. Devious? Maybe. But also one step in the fight against censorship.
WARNING: The plugin was designed to take advantage of the huge hard drive space/bandwidth allotments of some hosting providers and shouldn't be used if you are charged for either by the MB.