I'm a bit disappointed by the XP version's use of bitmaps for certain elements; it's completely possible to achieve the XP look purely with box-shadow properties.
I wanted to disagree, most likely because I'm one of the few who completely skipped XP jumping straight from 2000 to Vista. But I can't, turns out you are right, on that project page, in isolation, the elements actually do look good! Much better than what I think of when I think "XP" (mostly the task bar, start button and main window decorations I guess)
Well, I am a Mac guy as well, but I did use Windows quite a bit in the past (.NET dev) and I always much preferred the more "serious" aesthetic of Windows 2000 (very similar to 98) than the "toy" aesthetic of Windows XP.
