CSS3 Experiment: Aero
Sometimes it's cool to just try stuff out in web development without having to support every old browser. Here's the result of playing around for an afternoon attempting to recreate Windows Aero look using just CSS in the current browsers (Firefox 21, Chrome 27, MSIE 10).
Click through to the test page to read more about the incompatibilities I did still encounter.
On a completely unrelated note, I actually rather like the look of Aero and its disappearance is one of the things I don't like about Windows 8 (the other major thing being the in-your-face start screen).