So although Silverlight is not available... most of the video services now work. Those that don't work through the websites seem to have all released a window's application that is available through the app store.
Lisa, Lovefilm is a major provider, owned by Amazon, and it doesn't work on Windows RT either in the web browser or via an app. And it's not just entertainment channels that don't work. I have to access video website for work sometimes, such as the UK
Parliament site, and that doesn't work either.
Rather than making all the providers re-write their sites to be compatible with RT it would have been much smarter if they had made RT compatible with them. Working with the world as it is, rather than as they would wish it to be.
Hopefully the new management of Microsoft will be a bit more savvy. They have some great technology but they haven't leveraged it effectively because, with RT and in many other ways, they haven't finished the job.