Windows media center 7 is already a good media center on its own.  But adding some additional addons can really make this software great.  Two of my favorite apps for the media center are life extender and the hulu integrator.  The Hulu integrator is self explanatory since it just integrates Hulu to your media center.  The life extender will remove all commercials from your recorded shows.  To read more about these two apps and to see the other 8 please refer to the link below.