I saw a gay adult website (Gay Yappo) the other day that offered content in Silverlight format. It's the first one I have noticed so I added a content option to GayGeek for Silverlight. So far I haven't found any other websites that use it but I suppose over time some may.

It requires a lot of effort to go back and redo videos in new resolutions and formats, so I suspect it'll be more popular among starting websites and video on demand sites that are re-doing their entire library.

--Aaron