Taskbar Overlord is a free download for Windows 7 only, with the AutoHotkey source code available and separate downloads in case you want one feature but not the other. It allows Windows 7 taskbar to work more efficiently by enabling middle-clicking to close applications.
“One of the biggest differences is the new taskbar, where you can pin the programs you use most for easy access. In effect, the taskbar now handles application switching and launching. It also groups multiple windows of a program together under one icon, as seen in the screenshot below where two explorer windows are open.
While the new taskbar is almost perfect, it’s inflexibility in a couple of areas really frustrated me.
First, I hate, and I mean hate the fact that when multiple windows of an application are open, clicking on the program icon pops up the thumbnail previews instead of restoring the last active window. I’m such an OCD multi-tasker that I could not get used to having to decide which window it was that I was working with. I also hate that it now takes two clicks to restore a minimized window instead of one. The inability to change this is all the more insulting since you can just hover over an icon and see the thumbnails when you need them. So why must clicking on the icon also show the thumbnails if I don’t want it to?
The second issue is simple enough. If you middle click on an icon, it opens a new window of that program. But you can already open new instances by holding down shift and left clicking. I wanted to middle click on an icon and close all of its windows, similar to how Firefox closes tabs if you middle click on them.”
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