There are a number of ways to stream video to your audience. Got a film under 15 minutes and want it to be public then it is very hard to go past Youtube as the site is popular and hosting is free. What if your video is longer than 15 minutes and it's all your own work well then you can choose between Vimeo or Viddler  which are also free but the material must not be for commercial gain. There have been stories of companies on Vimeo  having their videos removed because they were commercial. Vimeo has a paid service for less and $100 a year and while this gives more functionality it still mustn't be commercial videos.