Fire up an xterm (a real one) and observe the first option on the menu if you press CTRL-F1 is Secure Keyboard. It is intended to be used for exactly the sort of thing you mention. X had thought of security and built it in long before NT 3.1 'invented' it, the GNOME/KDE kids simply forgot about that sort of thing along with most of the other good parts of X.
Seems to be a pattern with modern graphical free software development to repeat all of Microsoft's security mistakes and for the same reason. The mad rush to bring about 'the Year of Linux on the Desktop' is producing the exact same marketing based security policies that we have laughed our butts off over when Microsoft originally made em. But apparently we learned nothing.
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