Strangely, one of the things I am looking forward to most for the XBox 360 is the inclusion of a real music visualizer.  Frankly, since switching off WinAmp more than a few years ago I have been missing decent visualizations.  The ones available for Media Player just don't cut it.  There are some video's of what Minter is doing on XBox 360 floating around the web, and from what I have seen it looks absolutely awesome.