Reinstalled one of my laptops with Ubuntu Server 10.10 and put Gnome on it as well.
While I was accessing the Gnome Desktop with VNC I experienced some strange behavior. Entering the letter 'd' minimized the Window. A little bit of research showed that this can be solved by changing the following setting:
System -> Preferences -> Keyboard Shortcuts
Scroll down to "Hide all normal Windows and set focus to the desktop"
In there the letter 'D' should be present. Set this to disable and enjoy Gnome as it was meant to be.