d key gnome keymapping gconf terminal emulator

http://ubuntuforums.org/archive/index.php/t-1595871.html

if not present sudo apt-get -y install gconf-editor

use the following
1) Alt+F2
2) gconf-editor
3) /->app->metacity->global_keybindings
4) Change the assigned keystroke for show_desktop from "<Super>d" to "<Ctrl>d" or "<Ctrl><Alt>d" or "disabled"


you will have to copy "disabled" from another field and paste it to the "show_desktop".  It is set to <super>D which blows.