ARS Technica has compared the new Windows 7 Taskbar with the OS X Dock, you can check it out over here.
Windows 7's new Taskbar has drawn many comparisons to Mac OS X's Dock, and many of them negative, with the overwhelming concern that Windows is becoming too Mac-like. Even among Mac users, the new Taskbar is unlikely to be universally appreciated, as many feel that the Dock is deeply flawed.
On a superficial level, the similarity is obvious; both Dock and Taskbar are rows of large icons used for application launching and switching. Closer examination, however, reveals that there's a long way to go before anyone should worry that Microsoft is slavishly following Apple. The Windows UI isn't turning into the Mac OS X UI—not yet, at least..