Sloppy focus
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Windows has an option for doing this with the Tweak UI powertoy.
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Indeed, I've used it for a while, but it works pretty badly. For example it is not sloppy focus, but focus-follows-mouse. That basically means that you can't park the cursor out of the way on the desktop, because that'll focus the desktop...
Unfortunately, the TweakUI approach isn't available for Vista/7. There's a registry hack, but it's horribly laggy---seems to poll where the mouse is every second then set the focus or something.
(The registry hack can be lagless if you configure it right, but it's not the default. Look for HKCU\Control Panel\Desktop\ActiveWndTrkTimeout, set it to something low. It does this because it also raises the window by default, which sucks very much if you have instant focus.)