A suggestion for Mac OS X Lion: since the team is trying to integrate the menubar into the desktop a bit more, to make it less prominent - the translucent menubar was an attempt at just this - why not go all the way and make it black? This way, it’ll blend into the bezel of (most) new Macs. Black menus are already all over iLife ’11, and it would be another step toward unifying the look of iOS and Mac OS.
Yes, this change would break many Mac apps if they didn’t update to support it. Apple’s no stranger to that, though.