Link to more detailed information about the Windows Media Center Internet TV beta
Earlier today, I posted some information about the Windows Media Center Internet TV beta that was released to Windows Vista Media Center users in the United States last night. Today, I found a blog post at http://windowsvistablog.com/blogs/windowsexperience/archive/2007/09/27/streaming-internet-content-with-internet-tv-beta-to-windows-media-center.aspx that describes the functionality available in this beta in more detail.
I encourage you to check out the feature descriptions listed there. Better yet, if you are in the United States and have Windows Vista Home Premium or Ultimate, launch Media Center and check it out for yourself from the TV + Movies strip on the start menu.