I am an Italian audio enthusiast audio engineer. I have extensively used your Media Center product in my studies on the organization of the human brain. The human brain is -wow!- 50% music, and when it comes to music your Media Center really rocks.
In order to better classify music, I would find it very userful to have "Genre" and "Note" fields for Artists and Albums, in addition to Tracks. I am thinking of a simple relational database schema with ARTIST, ALBUM and TRACK tables.
Also, the "Note" field needs to be exploited. Instead of a poor and hidden editor like the current one, I would find much more useful an editor with selectable font and color (one font for the entire field would be enough), that can be recalled with a single keystroke (three separate hotkeys for Artist, Album and Track) or mouse click. I am not talking about a full RTF editor, that I would never use, but a quick yet aesthetically pleasing text editor.
Negopus.