¶Weird bug of the day
Today's bizarre bug: it seems that at least on my system, if I have any top-most windows on my desktop, hitting Windows+D twice in quick succession causes the top-most flag to spread to other top level windows. Thanks to this weird behavior, I now have Visual Studio, Firefox, a Command Prompt, and WinVi32 topmost and everything else I launch is getting dumped below them.
I don't generally run desktop adornment programs, so there aren't a lot of possible culprits here... I think it's basically either Windows 7 x64 or NVIDIA nView (which should be off).