YOUTUBE.It is the no.1 one video streaming website presently.Just type and search and there are a lot of videos.You can find videos of any category.Whetehr it is Music Video or Documentry or Movies or Funny Videos.You can also watch the Serials that you have missed on TV.
Its the best Video sharing Community or website.You can also upload your own videos to help the world.Well I can say, Youtube is one of best products of Google.It depends on you how u use it and for what purpose u use it.