Windows 7 taskbar is better than Mac OSX dock
Never use a Mac, but from what I've heard on the net I think I can tell that Windows 7 taskbar is way better than Mac OSX dock.
The new taskbar in Windows 7 is the biggest revolution in the Windows UI since Windows 95. With the new taskbar, you can pin your favorite programs to the taskbar, just like in a Dock in Mac OSX. The good thing about this is that; if there are lots of icons, the buttons is divided into pages; whereas in OSX the icon is resized to fit on the screen; which is not good if you have too many icons then the icons is too small to be useful.
On the other hand, both Windows 7 taskbar and the Mac OSX dock shares the same shortcoming. Both has no labels for the icons at all, unless the user hovers the mouse over the icon. Also, not many program make use of these new UI properly.
For example, only control panel, Internet Explorer, Windows Live Messenger, Google Chrome, and Windows Virtual PC make use of the Windows 7 taskbar, and only iTunes, Safari, and some other specially coded Mac apps make use of the dock.
So, neither of these is the ultimate winner because both of these UI shares some problems, but Windows 7 taskbar is certainly better than the Mac OSX dock in some ways.