Microsoft have updated it’s Xbox SmartGlass app for Windows 8 and Windows RT.
Xbox SmartGlass lets you use your Windows 8 device as a second screen to intelligently interact with your Xbox 360. It helps your devices work together to enhance your TV shows, movies, music, sports, and games. Control and interact with what’s on your TV with simple gestures on your Windows device.
This update includes (it looks very similar to the last update release notes):
Various performance enhancements and feature updates, including the addition of support for Internet Explorer on Xbox 360 and rich interactive experiences that can show new content related to what you’re watching on your TV at the moment.
You can download the Xbox SmartGlass app from the Windows Store.