This is along the same lines as our iPhone PSD. Everyone here in our office seems to get these form elements and browser windows from different sources, some of them are good, most are out of date. So, in an effort to keep our stuff up-to-date and consistent we put together our own. Included is a set for Mac Firefox 3 and another for Vista IE7.
If you’re a web designer and think this may be useful, you can download it here.