apps such as ncftp, fdisk when hitting the backspace and delete prints control characters to the screen instead of proper behaviour. Setting gnome-terminal preferences to swap the backspace/del key fixes this problem. This should be the default behaviour. This is present in the latest build.
fdisk does not link termcap or terminfo, so not surprising it doesn't understand many keypresses. ncftp doesn't appear to use termcap or terminfo either. gnome-core-1.0.55-10 and later have backspace/delete swapped by default for gnome-terminals, as far as my testing shows.