Hey
I've a couple of suggestions for 'improvments'.
First of all, I'd like an "playing now" window in the button left corner above the controls. This window should only contain the current song beeing played and possiblly the next 10 song. This way you can both see what songs are next in your list and still be in the media library, where you can search for songs and such. Draging a new song that you've just search for into the this new window shouldnt be a big problem. I find it alot more user-friendly if I both can see my playerlist and have the option to search for songs, all without changing window.
Another thing, how about an option to un-select 'web media' and 'tv tuner' as these are options I never use.