Vidipedia – The video wiki
Vidipedia is a video encyclopedia that anyone can edit. It is similar to Wikipedia and hosts only videos. But it is hard to see how it can replace Youtube or Google videos. But I think Vidipedia can be a great site if it is able to properly categorize and organize videos. It should also be able to filter out the junk videos all too common in Youtube.
Uploading a video or editing a page requires registration. Also the site is in the early stage and there are only a handful of videos available under each category. Just like youtube, vidipedia allows for embedding videos outside the site.
Check out this interesting video about Web 2.0 see on Vidipedia,