Silverlight makes working with videos pretty straight forward, Microsoft makes Silverlight pretty straight forward with ASP.net and sharepoint is written in ASP.net, so match made in tech heaven!! I wanted a video player web part for sharepoint, that had some simple functionality like play, pause and volume. I started with expression encoder which output a nice media player interface...this is OK, but has a couple of restrictions; 1, its far to rich for what I wanted, animations all over the place...