Ctrl+Alt+Del to open System Monitor

In Ubuntu

If you want to enable Ctrl+Alt+Del to open System Monitor you have to do this:

Run in terminal:

gconftool-2 -t str --set /apps/metacity/global_keybindings/run_command_1 "Delete"
gconftool-2 -t str --set /apps/metacity/keybinding_commands/command_1 "gnome-system-monitor"