Just wanted to chime in and say 'thank you!' for this wonderful little app: fast, beautiful, fast, perfectly integrated, fast (did I say it's fast? :-)

Oh, and I'd like to add my vote of preference for the "black UI": as Adam Betts said, it's more and more used and its wonderful "not in your face" look is perfect for The Unarchiver (Apple is also using it in the upcoming Web Inspector in Safari, and it couldn't look more elegant: http://webkit.org/blog/?p=41 )