Already exists.

A bittorrent client can't organize, check for duplicates, nor arrange my music into playlists.

Mind you, the main reason I even have iTunes on my list... my music is sorted by iTunes, I access that music - since it's DRM free now - via my Zune Software, and sync to either my Zune (for LONG trips) or to my iPhone (for workouts).

I've had other players in the past, so I'm not against copy/paste. Nor am I against sorting my own files. But as it stands, I know the average Joe Sixpack will not fix their ID3 tags, nor keep a consistent naming scheme and weed out duplicates on their own.

And besides... bittorrent over 3G... it'll take days to get anything that way.

No thanks.