. . . well, Gracenote.
In January, I was wondering who the Gracenote of video/DVDs would be and it turns out that Gracenote will be powering what will be called "VideoID-DVD." This service will not only be available on the software side (ala iTunes), but also will be integrated into DVD and video players to provide comprehensive DVD video information.
This new system, built on the existing Gracenote platform should roll out some time in 2008.