Like many before me said - amazing and innovative dock, couldn't resist using this excellent theme on my phone
Just an idea for future versions - how about placing the blue orb with the phone button in the centre of this awesome 3D bar you have in the original theme, with say Mail and Safari icons on the let of it and the SMS and iPod icons on the right? Of course the user would have to use say XLaunch to "squeeze" the fifth (SMS) icon onto the dock.
You could also make the blue phone orb a bit smaller to allow for more room on the 3D bar, and maybe give the other dock items subtle colour accents, for example light red for mail, blue for safari, green for SMS and orange or white for ipod.
I realize that would not be strictly speaking a WMP theme but it might just look nice. Thanks a lot for this great looking theme!