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I'm thinking about taking a crack at dev for this thing, and the first thing I'd like to see is a better way to sort and group in the my music library. For those with massive music libraries, it can be cumbersome to rowse by, say, ONLY genre.  It'd be nice to group by genre ? artist, or any user0defined set of groupings. 

I'd also like to be able to add a 'search filter' so that i can look at only certain sets of songs in my library (think itunes)

Any ideas/examples of good interfaces?  I can't guarantee that I'll be able to do this, but I'd like to give it a shot.