Daphne

Daphne is a small (system tray) application for killing, controlling and debuging window's processes. You can kill a process by dragging the mouse over the windows, by right-clicking the process in the main process list, or by typing its name with the "Kill all by name" command. You can set a any window to be always on top, to be transparent, to be enable, et cetera. The main window displays a list of currently running process with detailed information about:

* CPU usage
* Process ID
* Process name
* Full path (and arguments)
* Priority
* Class (Process / Service)
* Current memory usage
* Peek memory usage
* Current swap usage
* Peek swap usage
* Number of threads

I have always found the "Windows Task Manager" insufficient in tracking my processes. With each process having their own quirky names (for a layman like me ;) ) and even worse their usual hangs on Windows, I find it extremely difficult to identify and track such processes. Daphne has some useful features like the "Control Inspector" to identify the processes from the application GUI and tracking of peak values of the parameters and of course the location of the processes in the system. See Daphne in action here.
Released under the GPL this is one plugin that will be definitely useful in Windows.