Enough with the righteous outrage. If you actually watched the video, MS Windows 7's taskbar behaves differently from Leopard's dock in how it groups minimized Windows by program. (However, it's nice that Leopard's Apple-Tab is by program instead of by window).
And so many Mac users give snooty arguments about Windows, saying "Yuck" about the interface as if that is a sufficient argument in of itself. Do you have any actual criticism from a useability or design standpoint other than that it superficially resembles the dock?
Oh, and the real
shameless rip-off of Leopard's dock is RocketDock.
http://www.rocketdock.com/