IDEA: Pause/Suspend Others

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-Every other process gets paused. 100% free CPU.
-Excludes (e.g. right click window title "Don't pause this process" or in the Task Manager)
-If possible, the paused process gets dumped to virtual memory, freeing up RAM.
-Timed: if processes are switched often between, don't pause them until they've been non-focused n seconds.

With ProcExp and PsSuspend.exe
http://technet.microsoft.com/en-us/sysinternals/bb897540.aspx
you can pause processes.

The difficulty is switching back to paused processes... perhaps another switcher, replacing alt-tab. Even an alternative taskbar.

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Another software would be one that just suspends every other process with one click. Another click/hotkey resumes everything.

It should be as easy as: list processes, suspend everything but the active window. With excludes of course.

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You could have a process list with checkboxes for Suspend and Kill. Necessary system processes would be left unchecked by default, but if they can be suspended/killed and then resumed/restarted with no ill effect, why not?
The processes you want to be able to resume, such as Firefox, you would suspend, others you'd kill for the free memory. Resume restarts the killed processes.