If you are considering to host videos on your web site, we recommend you to read a nice post on saving cost of video hosting by reducing network bandwidth usage by ScottGu.
ScottGu explains how web site owners can use the free video hosting services of Microsoft's Silverlight and Google's YouTube. Also he explains about the new IIS Module which throttles the video download if you would like to host videos on your own streaming servers.
If you are a blogger or ASP.NET web site developer it is worth reading this article.
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