I’ve blogged about recently upgrading to windows 8 on my media center. I now have everything running as it was. Including the best accessory to media center, Remote Potato. (www.remotepotato.com/)
This application allows you to remotely view and control your media center. It can stream to a browser (silverlight) or through their mobile app. The team recently updated the app to have windows 8 support.
I use it frequently to watch movies on my PC and on the iPad.