An alternative to YouTube. Next Vista for Learning is the first video sharing site that I recommend to teachers looking for alternatives to YouTube. Videos on Next Vista are made by teachers and students for teachers and students. Throughout the school year Next Vista hosts video creation contests for students and teachers.
wireWax is a service that takes the concept of YouTube annotations and makes it much better. On wireWax you can build interactive tags into your videos. Each tag that you add to your video have another video from YouTube or Vimeo or an image from Facebook, Flickr, or Instagram. A tag can also include an audio track from SoundCloud or a reference article from Qwiki.