At the CES 2006 show last week, Bill Gates demo'd some new stuff in the upcoming Windows release. This was previously known as Longhorn, but that was a code word, and the real name is "Vista". Whatever.
Anyway, a Mac fan had an inspiration from watching his demo. And he overlayed Bill's voice explaining Vista/Longhorn features on top of a video of running through the equivalent features in Mac OS X. Features that were either new with 10.4 (Tiger) or had existed for awhile.
Of course Apple sometimes borrows ideas from elsewhere. In fact, all the GUI developers are riffing off each other all the time. My mother is still an Amiga fan (still, after all these years) and will go on tirades about how both Microsoft and Apple stole all sorts of brilliant ideas from AmigaOS. Sigh