I've been designing several new Track Info template for use with MC12. Many of them are designed to incorporate hyperlinks to external sites for additional information (songfacts, yahoo music, all music, etc.) I launch them in a separate IE7 browser set to full screen because of the lack of backwards navigation in MC12. This is not really so bad anyway.
I also use these links to search for cover art, lyrics, etc to update my library. I found that many times while listening to a track someone will ask "What else do you have by this artist?" I have already setup my library view to display 3 tabs with Now Playing, Display and full library tabs. I don't see any way to filter that display dynamically. I think it would be great to provide a view option (either pre-defined or using a filter) that could allow a library view specific information based upon the track that is currently palying. For example, allow for variables to be passed to a library view that would filter the data based upon Artist, Album, Even song for those of us with multiple version of the same song. It seems that this may be possible with some of the advanced expression options of the library view if it would recognize passed variable.
Just my $.02